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Detained observers from the Organization for Security and Co-operation in Europe arrive to take part in a press conference in the eastern Ukrainian city of Slavyansk on Sunday, April 27.
Ukrainian troops stand guard behind a barricade made of sandbags at a checkpoint about 30 kilometers (20 miles) from Slavyansk on April 27.
Relatives and friends of a man killed in a gunfight participate in his funeral ceremony in the eastern Ukrainian city of Slavyansk on Saturday, April 26. Ukraine has seen a sharp rise in tensions since a new pro-European government took charge of the country in February.
U.S. troops arrive at the air force base near Siauliai Zuokniai, Lithuania, on April 26. The United States is conducting military exercises in Poland, Latvia, Estonia and Lithuania. The exercises are, in part, a response to the ongoing instability in Ukraine.
Ukrainian government troops in armored personal carriers travel on a country road outside the town of Svyitohirsk near Slavyansk in eastern Ukraine on April 26. Two tortured bodies have been found near Slavyansk, one of which was pro-Kiev politician Vladimir Rybak, who Ukraine’s Interior Ministry said Wednesday died as a result of injuries from torture and drowning.
Pro-Russian armed militants inspect a truck near Slavyansk on Friday, April 25. Russian Foreign Minister Sergey Lavrov has accused the West of plotting to control Ukraine and said the pro-Russian insurgents in the southeast would lay down their arms only if the Ukrainian government clears out the Maidan protest camp in the capital, Kiev.
Pro-Russian militants keep records of their duty at the barricades in Slavyansk, eastern Ukraine, April 25.
Ukrainian troops take position near burning tires at a pro-Russian checkpoint in Slavyansk following an attack by Ukrainian soldiers on Thursday, April 24.
Ukrainian special forces take position at an abandoned roadblock in Slavyansk on April 24.
A Ukrainian special forces member takes position in Slavyansk.
Cossacks carry a coffin into a church in Slavyansk on Tuesday, April 22, during a funeral for men killed in a gunfight at a checkpoint two days before.
U.S. Vice President Joe Biden talks with Ukrainian Prime Minister Arseniy Yatsenyuk during a meeting in Kiev, Ukraine, on April 22.
An armed pro-Russian man stands on a street in Slavyansk on Monday, April 21.
Demonstrators attend a pro-Russian rally outside the secret service building in Lugansk, Ukraine, on April 21.
Cars are burned out after an attack at a roadblock in Slavyansk on Sunday, April 20.
A resident inspects burnt-out cars at the roadblock on April 20.
A pro-Russian militant is seen at the roadblock near Slavyansk on April 20.
Armed pro-Russian militants stand guard at the roadblock near Slavyansk on April 20.
A masked man stands guard outside a regional administration building seized by pro-Russian separatists in Slavyansk, Ukraine, on Friday, April 18.
People walk around barricades April 18 set up at the regional administration building seized earlier in Donetsk, Ukraine.
Russian President Vladimir Putin speaks to the media after a nationally televised question-and-answer session in Moscow on Thursday, April 17. Putin denied that Russian forces are involved in the unrest in eastern Ukraine, though he did admit for the first time that Russians were active in Crimea before the peninsula voted to join the country.
Ukrainian riot police officers stand guard during a pro-Ukrainian demonstration in Donetsk on April 17.
Masked pro-Russian protesters stand guard in front of the city hall in Mariupol, Ukraine, on April 17.
U.S. Secretary of State John Kerry reaches out to shake hands with Russian Foreign Minister Sergey Lavrov at the start of a bilateral meeting to discuss the ongoing situation in Ukraine. The meeting took place April 17 in Geneva, Switzerland.
A masked gunman stands guard near tanks in Slavyansk, Ukraine, on Wednesday, April 16.
A Ukrainian helicopter flies over a column of Ukrainian Army combat vehicles on the way to Kramatorsk, a city in eastern Ukraine, on April 16.
A masked pro-Russian gunman guards combat vehicles parked in downtown Slavyansk on April 16.
A man talks with Ukrainian soldiers as they are blocked by people on their way to Kramatorsk.
Ukrainian soldiers sit atop combat vehicles on their way to Kramatorsk.
Ukrainian Gen. Vasily Krutov is surrounded by protesters after addressing the crowd outside an airfield in Kramatorsk on Tuesday, April 15.
Pro-Russian activists guard a barricade April 15 outside the regional police building that they seized in Slavyansk.
Ukrainian troops receive munitions at a field on the outskirts of Izium, Ukraine, on April 15.
Armed pro-Russian activists stand guard on top of a Ukrainian regional administration building in Slavyansk on Monday, April 14.
A pro-Russian activist carries a shield during the mass storming of a police station in Horlivka, Ukraine, on April 14.
Russian supporters attend a rally in front of the security service building occupied by pro-Russian activists in Luhansk, Ukraine, on April 14.
A man places a Russian flag over a police station after storming the building in Horlivka on April 14.
Men besiege the police station in Horlivka.
The Horlivka police station burns on April 14.
A Ukrainian police officer receives medical care after being attacked at the police station in Horlivka on April 14.
Pro-Russian supporters beat a pro-Ukrainian activist during a rally in Kharkiv, Ukraine, on Sunday, April 13.
Pro-Russian activists escort a man outside the secret service building in Luhansk on April 13.
Pro-Russian protesters guard a barricade in Slavyansk on April 13 outside a regional police building seized by armed separatists the day before.
Armed pro-Russian activists carrying riot shields occupy a police station in Slavyansk on April 12.
A group of pro-Russian activists warm themselves by a fire Friday, April 11, in front of a Ukrainian Security Service office in Luhansk.
Ukrainian Prime Minister Arseniy Yatsenyuk speaks April 11 during his meeting with regional leaders in Donetsk, Ukraine. Yatsenyuk flew into Donetsk, where pro-Russian separatists occupied the regional administration building and called for a referendum.
Pro-Russian young men look over the fence of a military recruitment office in Donetsk on Thursday, April 10.
Armed pro-Russian protesters occupy the Security Service building in Luhansk on April 10.
Members of the self-proclaimed government the “Donetsk Republic” vote April 10 during a meeting at the seized regional administration building in Donetsk.
Ukrainian lawmakers from different parties scuffle during a Parliament session in Kiev, Ukraine, on Tuesday, April 8.
Workers clean up on April 8 after pro-Russian separatists and police clashed overnight in Kharkiv.
Pro-Russian protesters burn tires near a regional administration building in Kharkiv after police cleared the building on Monday, April 7.
A masked man stands on top of a barricade at the regional administration building in Donetsk on April 7.
Protesters wave a Russian flag as they storm the regional administration building in Donetsk on Sunday, April 6. Protesters seized state buildings in several east Ukrainian cities, prompting accusations from Kiev that Moscow is trying to “dismember” the country.
Pro-Russian protesters clash with police as they try to occupy a regional administration building in Donetsk on April 6.
Pro-Russian activists hold a rally in front of a Ukrainian Security Service office in Luhansk on April 6.
A young demonstrator with his mouth covered by a Russian flag attends a pro-Russia rally outside the regional government administration building in Donetsk on Saturday, April 5.
A Ukrainian soldier guards a road not far from Prokhody, a village near the Russian border, on April 5. Ukrainian and Western officials have voiced alarm about Russia’s reported military buildup on Ukraine’s eastern border.
Ukrainian cadets at the Higher Naval School embrace a friend who has decided to stay in the school during a departure ceremony in Sevastopol, Crimea, on Friday, April 4. Some 120 cadets who refused to take Russian citizenship left the school to return to Ukraine.
Soviet military veterans take part in a flower-laying ceremony at the Soviet-era World War II memorial in Sevastopol on Thursday, April 3.
Ukrainian soldiers conduct a training session on the Desna military shooting range northeast of Kiev on Wednesday, April 2.
Russian soldiers prepare for diving training in front of a Tarantul-III class missile boat Tuesday, April 1, in Sevastopol.
People pass by barricades near the Dnipro Hotel in Kiev on April 1.
People walk past a train loaded with Russian tanks Monday, March 31, in the Gvardeyskoe railway station near Simferopol, Crimea.
A Russian solder sits in a tank at the Ostryakovo railway station, not far from Simferopol on March 31.
Russian Prime Minister Dmitry Medvedev speaks about the economic development of Crimea during a meeting March 31 in Simferopol.
Members of the Ukrainian National Guard take part in military exercises on a shooting range near Kiev on March 31.
A woman cries Sunday, March 30, during a gathering to honor those who were killed during protests in Kiev’s Independence Square.
A woman and child walk past a line of police officers during a rally in Kharkiv on March 30.
Ukrainian soldiers take part in a training exercise at a military base in Donetsk on Saturday, March 29.
Demonstrators protest Friday, March 28, in Kiev, displaying police vehicles they seized during earlier clashes with authorities.
Members of the Right Sector group block the Ukrainian parliament building in Kiev on Thursday, March 27. Activists called for Interior Minister Arsen Avakov to step down after the recent killing of radical nationalist leader Oleksandr Muzychko, who died during a police operation to detain him. Muzychko and the Right Sector are credited with playing a lead role in the protests that toppled Ukrainian President Victor Yanukovych.
Ukrainian tanks are transported from their base in Perevalne, Crimea, on Wednesday, March 26. After Russian troops seized most of Ukraine’s bases in Crimea, interim Ukrainian President Oleksandr Turchynov ordered the withdrawal of armed forces from the Black Sea peninsula, citing Russian threats to the lives of military staff and their families.
Ukrainian marines wave as they leave a base in Feodosia, Crimea, on Tuesday, March 25.
Russian sailors stand on the deck of the corvette ship Suzdalets in the bay of Sevastopol on March 25.
Pro-Russian militia members remove a resident as Russian troops assault the Belbek air base, outside Sevastopol, on Saturday, March 22. After its annexation of Crimea, Russian forces have consolidated their control of the region.
Soldiers in unmarked uniforms sit atop an armored personnel carrier at the gate of the Belbek air base on March 22.
A Russian sailor holds the Russian Navy’s St. Andrew’s flag while standing on the bow of the surrendered Ukrainian submarine Zaporozhye on March 22 in Sevastopol.
Russian President Vladimir Putin signs the final decree completing the annexation of Crimea on Friday, March 21, as Upper House Speaker Valentina Matviyenko, left, and State Duma Speaker Sergei Naryshkin watch.
A Ukrainian serviceman leaves a Ukrainian military unit that Russian soldiers took control of in Perevalne on March 21.
Ukrainian border guards run during training at a military camp in Alekseyevka, Ukraine, on March 21.
Russian soldiers patrol the area surrounding a Ukrainian military unit in Perevalne on Thursday, March 20.
Pro-Russian protesters remove the gate to the Ukrainian navy headquarters as Russian troops stand guard in Sevastopol on Wednesday, March 19.
Pro-Russian forces walk inside the Ukrainian navy headquarters in Sevastopol on March 19.
A member of pro-Russian forces takes down a Ukrainian flag at the Ukrainian navy headquarters in Sevastopol on March 19.
Alexander Vitko, chief of the Russian Black Sea Fleet, leaves the Ukrainian navy headquarters in Sevastopol after pro-Russian forces took it over on March 19.
A Russian flag waves as workers install a new sign on a parliament building in Simferopol, Crimea’s capital, on March 19.
Russian military personnel surround a Ukrainian military base in Perevalne on March 19.
Nameplates on the front of the Crimean parliament building get removed Tuesday, March 18, in Simferopol.
From left, Crimean Prime Minister Sergey Aksyonov; Vladimir Konstantinov, speaker of the Crimean parliament; Russian President Vladimir Putin; and Alexei Chaly, the new de facto mayor of Sevastopol, join hands in Moscow on March 18 after signing a treaty to make Crimea part of Russia.
Demonstrators hold a Crimean flag at Lenin Square in Simferopol on March 18.
Ukrainian soldiers stand guard at a checkpoint near Strilkove, Ukraine, close to Crimea on Monday, March 17.
Former boxer and Ukrainian politician Vitali Klitschko addresses reporters in Kiev on March 17.
Ukrainian troops stand guard in front of the Ukrainian Parliament building in Kiev on March 17.
A Ukrainian man applies for the National Guard at a mobile recruitment center in Kiev on March 17.
Civilians walk past riot police in Simferopol on March 17.
A Ukrainian soldier stands on top of an armored vehicle at a military camp near the village of Michurino, Ukraine, on March 17.
Policemen stand guard outside the regional state administration building in Donetsk during a rally by pro-Russia activists March 17.
Armed soldiers stand guard outside a Ukrainian military base in Perevalne on March 17.
A man holds a Crimean flag as he stands in front of the Crimean parliament building in Simferopol on March 17.
Crimeans holding Russian flags celebrate in front of the parliament building in Simferopol on Sunday, March 16.
A Ukrainian police officer tries to shield himself from a road block thrown by pro-Russia supporters in Kharkiv on March 16.
Pro-Russia demonstrators storm the prosecutor general’s office during a rally in Donetsk on March 16.
A woman leaves a voting booth in Sevastopol on March 16. See the crisis in Ukraine before Crimea voted
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Kiev, Ukraine (CNN) — A perilous face-off intensified Saturday when Russia state news complained that Ukraine had mobilized 15,000 troops in the suburbs of Slavyansk in eastern Ukraine “in order to wipe out the city and its residents.”
Quoting a Russian Defense Ministry source, RIA Novosti said satellite photos showed the force forming around the city that has become a friction point between the Ukraine military and pro-Russian militants.
The Defense Ministry source said the number of Ukraine troops put the pro-Russian militants at a disadvantage because the latter are “armed only with small amount of pistols and shotguns.” Many eastern Ukraine residents have Russian roots and sympathize with Moscow.
The source said the photos showed about 160 tanks, 230 infantry combat vehicles and armored personnel carriers, mine throwers and multiple-launch rocket systems.
Russian President Vladimir Putin has repeatedly criticized Kiev’s use of force against Ukrainian civilians.
Developments in Ukraine have come at a rapid pace in recent days:
— Russia, which already had 40,000 troops on its side of the border, started new military drills a few days ago after Ukrainian forces said they killed five pro-Russian militants. Ukraine launched the second stage of an “anti-terrorist operation” against militants in Slavyansk.
— On Friday, a team of European and Ukrainian military observers were seized Friday by pro-Russian separatists in Slavyansk.
— Russian military aircraft “crossed and violated” Ukrainian airspace seven times overnight, Ukrainian Prime Minister Arseniy Yatsenyuk told reporters in Rome on Saturday. The Russian Defense Ministry denied the accusation, according to the state news agency Itar-Tass.
— Yatsenyuk met with Pope Francis while in Rome on Saturday. The meeting has been seen as a sigh of support from the Vatican for his government.
— G7 leaders said they would impose new sanctions on Russia over its role in the crisis.
The Ukrainian Prime Minister urged Russia to pull back its security forces and not to support pro-Russian militants in eastern and southern Ukraine. “We urge Russia to leave us alone,” he said in televised remarks.
Ukraine’s government has promised constitutional reforms and protections for Russian speakers in a bid to ease the tensions in its eastern regions.
Inspectors seized in Slavyansk
On Saturday, the fate of the military inspectors preoccupied world leaders.
The inspectors from the Organization for Security and Co-operation in Europe were detained Friday as they entered Slavyansk, along with five Ukrainian military representatives and the driver of their bus, Ukraine’s Interior Ministry said.
Ukraine’s Security Service, the SBU, said the group is being kept under “inhumane conditions” in the basement of a building held by the militants.
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The self-declared mayor of Slavyansk, Vyacheslav Ponomarev, told reporters that one of the “prisoners” has diabetes, but he has the medicine he needs and will be given his own quarters overnight.
Separatist leader Denis Pushilin, self-declared chairman of the so-called “Donetsk People’s Republic,” told CNN he doesn’t believe they are from the OSCE, but that some are NATO spies.
The German Foreign Office said it had set up an emergency task force to find out what has happened to the team members, four of whom are German. The others are from Denmark, Poland, Bulgaria and the Czech Republic, Russian state media said.
The OSCE mission in Ukraine is tasked with helping to implement an international agreement signed nine days ago in Switzerland, which called for illegal militia groups to disarm and leave occupied buildings, among other provisions.
In a phone call with U.S. Secretary of State John Kerry, Russian Foreign Minister Sergey Lavrov asked the United States to use its influence to secure the release of pro-Russian leaders being held in Ukraine.
Kerry urged Russia to support efforts of the OSCE and the government of Ukraine to liberate the inspectors and their Ukrainian guides, according to a senior State Department official.
Targeted sanctions
Against the backdrop of increasing volatility in Ukraine, leaders of the G7 industrialized nations on Friday announced they would “move swiftly to impose additional sanctions on Russia” over its actions in Ukraine.
The statement from the group — which includes Canada, France, Germany, Italy, Japan, the United Kingdom and the United States — came hours after U.S. President Barack Obama threatened Russia with new sanctions.
CNN’s Gul Tuysuz reported from Kiev and Laura Smith-Spark wrote and reported from London. CNN’s Andrew Carey and Nick Paton Walsh in Slavyansk and journalist Victoria Butenko in Kiev contributed to this report. CNN’s Alex Felton, Bharati Naik, Ben Brumfield and Boriana Milanova also contributed.
People walk around barricades April 18 set up at the regional administration building seized earlier in Donetsk, Ukraine.
The Horlivka police station burns on April 14.
A Ukrainian police officer receives medical care after being attacked at the police station in Horlivka on April 14.
A Ukrainian soldier guards a road not far from Prokhody, a village near the Russian border, on April 5. Ukrainian and Western officials have voiced alarm about Russia’s reported military buildup on Ukraine’s eastern border. 
Ukrainian cadets at the Higher Naval School embrace a friend who has decided to stay in the school during a departure ceremony in Sevastopol, Crimea, on Friday, April 4. Some 120 cadets who refused to take Russian citizenship left the school to return to Ukraine.
Soviet military veterans take part in a flower-laying ceremony at the Soviet-era World War II memorial in Sevastopol on Thursday, April 3. 
Ukrainian soldiers conduct a training session on the Desna military shooting range northeast of Kiev on Wednesday, April 2. 
Russian President Vladimir Putin signs the final decree completing the annexation of Crimea on Friday, March 21, as Upper House Speaker Valentina Matviyenko, left, and State Duma Speaker Sergei Naryshkin watch. 
A Ukrainian serviceman leaves a Ukrainian military unit that Russian soldiers took control of in Perevalne on March 21.
Ukrainian border guards run during training at a military camp in Alekseyevka, Ukraine, on March 21.
A Ukrainian man applies for the National Guard at a mobile recruitment center in Kiev on March 17.
Civilians walk past riot police in Simferopol on March 17.
Russian President Vladimir Putin speaks to the media after a nationally televised question-and-answer session in Moscow on Thursday, April 17. Putin denied that Russian forces are involved in the unrest in eastern Ukraine, though he did admit for the first time that Russians were active in Crimea before the peninsula voted to join the country.
Ukrainian riot police officers stand guard during a pro-Ukrainian demonstration in Donetsk on April 17.
Pro-Russian supporters beat a pro-Ukrainian activist during a rally in Kharkiv, Ukraine, on Sunday, April 13.
Pro-Russian activists escort a man outside the secret service building in Luhansk on April 13.
Russian soldiers prepare for diving training in front of a Tarantul-III class missile boat Tuesday, April 1, in Sevastopol.
Russian soldiers patrol the area surrounding a Ukrainian military unit in Perevalne on Thursday, March 20.
Pro-Russian protesters remove the gate to the Ukrainian navy headquarters as Russian troops stand guard in Sevastopol on Wednesday, March 19.
Pro-Russian forces walk inside the Ukrainian navy headquarters in Sevastopol on March 19.
A member of pro-Russian forces takes down a Ukrainian flag at the Ukrainian navy headquarters in Sevastopol on March 19. 
A Ukrainian soldier stands on top of an armored vehicle at a military camp near the village of Michurino, Ukraine, on March 17.
Policemen stand guard outside the regional state administration building in Donetsk during a rally by pro-Russia activists March 17.
Armed soldiers stand guard outside a Ukrainian military base in Perevalne on March 17.
A man holds a Crimean flag as he stands in front of the Crimean parliament building in Simferopol on March 17.
Crimeans holding Russian flags celebrate in front of the parliament building in Simferopol on Sunday, March 16.
