Activists paint graffiti outside a regional branch of Sberbank, Russia's largest bank, during a protest in Kiev
Activists paint graffiti outside a regional branch of Sberbank, Russia's largest bank, during a protest in Kiev April 18, 2014. Sberbank challenged Ukraine on Thursday to provide evidence of wrongdoing and hinted at legal action in response to a criminal investigation into whether the bank facilitated the financing of pro-Russian separatists. REUTERS/Valentyn Ogirenko (UKRAINE - Tags: POLITICS BUSINESS CIVIL UNREST)
An armed man stands guard in front of barricades outside the mayor's office in Slaviansk
An armed man, who is wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, stands guard in front of barricades outside the mayor's office in Slaviansk, 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Pro-Russian protesters sit near barricades at the police headquarters in the eastern Ukrainian town of Slaviansk
Pro-Russian protesters sit near barricades at the police headquarters in the eastern Ukrainian town of Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST)
A local boy poses for a picture with a pro-Russian armed man standing guard outside the mayor's office in Slaviansk
A local boy poses for a picture with a pro-Russian armed man standing guard outside the mayor's office in Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Armed men, wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, drive a car in Slaviansk
Armed men, wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, drive a car in Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Armed men stand guard in front of barricades outside the mayor's office in Slaviansk
Armed men, who are wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, stand guard in front of barricades outside the mayor's office in Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Armed men drive an armoured personnel carrier in Slaviansk
Armed men, wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, drive an armoured personnel carrier in Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)
Armed men drive an armoured personnel carrier in Slaviansk
Armed men, wearing black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, drive an armoured personnel carrier in Slaviansk 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/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST MILITARY)