The seperatist leader of the eastern Ukrainian city of Slavyansk, Vyacheslav Ponomaryov, holds up the pictures of two pro-Russia militants killed the day before in a gunbattle with unidentified attackers, as he holds a press conference in Slavyansk on April 21, 2014, a day after the pro-Moscow rebels in the town declared a curfew there. Vice President Joe Biden started a two-day visit to Kiev on April 21 in a pointed show of US backing as Russia accused Ukraine's government of "grossly breaching" a deal designed to de-escalate separatist tensions. AFP PHOTO/GENYA SAVILOV