Pro-Russian supporters gather outside the mayor's office in Slaviansk
Pro-Russian supporters gather outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ponomaryov addresses supporters in front of barricades outside the mayor's office in Slaviansk
Commander of the Slaviansk self-defence battalion Vyacheslav Ponomaryov addresses supporters in front of barricades outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
An armed man stands guard in front of barricades outside the mayor's office in Slaviansk
An armed man stands guard in front of barricades outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
An armed man gestures as he stands guard in front of barricades outside the mayor's office in Slaviansk
An armed man gestures as he stands guard in front of barricades outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
Pro-Russian supporters gather outside the mayor's office in Slaviansk
Pro-Russian supporters gather outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
People attend a pro-Ukrainian rally in Luhansk
People attend a pro-Ukrainian rally in Luhansk, eastern Ukraine April 18, 2014. The self-declared leader of pro-Russian separatists in eastern Ukraine, Denis Pushilin, on Friday said that he did not consider his men to be bound by an agreement between Russia and Ukraine to disarm and vacate occupied buildings. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
People attend a pro-Ukrainian rally in Luhansk
People attend a pro-Ukrainian rally in Luhansk, eastern Ukraine April 18, 2014. The self-declared leader of pro-Russian separatists in eastern Ukraine, Denis Pushilin, on Friday said that he did not consider his men to be bound by an agreement between Russia and Ukraine to disarm and vacate occupied buildings. The sign reads, "Strength in unity". REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
Pro-Russian supporters gather outside the mayor's office in Slaviansk
Pro-Russian supporters gather outside the mayor's office in Slaviansk April 18, 2014. Armed pro-Russian separatists in eastern Ukraine said on Friday they were not bound by an international deal ordering them to disarm and would not move out of public buildings they have seized until the Kiev government stepped down. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
A couple attends a pro-Ukrainian rally in Luhansk
A couple attends a pro-Ukrainian rally in Luhansk, eastern Ukraine April 18, 2014. The self-declared leader of pro-Russian separatists in eastern Ukraine, Denis Pushilin, on Friday said that he did not consider his men to be bound by an agreement between Russia and Ukraine to disarm and vacate occupied buildings. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)
People attend a pro-Ukrainian rally in Luhansk
People attend a pro-Ukrainian rally in Luhansk, eastern Ukraine April 18, 2014. The self-declared leader of pro-Russian separatists in eastern Ukraine, Denis Pushilin, on Friday said that he did not consider his men to be bound by an agreement between Russia and Ukraine to disarm and vacate occupied buildings. REUTERS/Vasily Fedosenko (UKRAINE - Tags: POLITICS CIVIL UNREST)