Ukrainian presidential candidate Tymoshenko speaks to members of the press after a news conference in Donetsk, in eastern Ukraine
Ukrainian presidential candidate Yulia Tymoshenko speaks to members of the press after a newsconference in Donetsk, in eastern Ukraine 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/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukraine agreement built on fragile foundations
UKRAINE-CRISIS/GENEVA:Ukraine agreement built on fragile foundations
Ukrainian presidential candidate Yulia Tymoshenko speaks during a news conference in Donetsk, in eastern Ukraine
Ukrainian presidential candidate Yulia Tymoshenko speaks during a news conference in Donetsk, in eastern Ukraine 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/Baz Ratner(UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
A pro-Russian separatists walk past map regional government building in Donetsk, in eastern Ukraine
A pro-Russian separatists walk past a map a regional government building in Donetsk, in eastern Ukraine 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/Baz Ratner(UKRAINE - Tags: POLITICS CIVIL UNREST)
Ukrainian presidential candidate Yulia Tymoshenko arrives to a press conference in Donetsk, in eastern Ukraine
Ukrainian presidential candidate Yulia Tymoshenko arrives to a press conference in Donetsk, in eastern Ukraine 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/Baz Ratner(UKRAINE - Tags: POLITICS CIVIL UNREST)
The head of pro-Russian separatists government Denis Pushilin speaks during news conference in Donetsk, in eastern Ukraine
The head of the pro-Russian separatists government Denis Pushilin speaks during a news conference in the regional government building in Donetsk, eastern Ukraine 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/Baz Ratner (UKRAINE - Tags: POLITICS CIVIL UNREST)
A masked pro-Russia protester stands guard at a barricade outside a regional government building in Donetsk, in eastern Ukraine
A masked pro-Russia protester stands guard at a barricade outside a regional government building in Donetsk, in eastern Ukraine 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/Baz Ratner(UKRAINE - Tags: POLITICS CIVIL UNREST)
A masked pro-Russia protester rebuilds a barricade outside a regional government building in Donetsk
A masked pro-Russia protester rebuilds a barricade outside a regional government building in Donetsk, in eastern Ukraine 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/Baz Ratner(UKRAINE - Tags: POLITICS CIVIL UNREST)
A dog wearing a face mask with black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, is seen in Slavyansk
A dog wearing a face mask with black and orange ribbons of St. George - a symbol widely associated with pro-Russian protests in Ukraine, is seen in Slavyansk 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 ANIMALS TPX IMAGES OF THE DAY)
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)