Ukrainian President Petro Poroshenko, left, walks past Russian President Vladimir Putin, right, during the commemoration of the 70th anniversary of the D-Day in Ouistreham, western France, June 6, 2014. The 2015 peace deal for eastern Ukraine was a diplomatic coup for Moscow, requiring Ukrainian authorities to offer self-rule to the Russia-backed separatist regions. (AP Photo/Alexander Zemlianichenko, file)
