Pro Russia protestors, right, throw eggs at pro Ukrainian activists in Donetsk, eastern Ukraine, Tuesday, April 22, 2014. U.S. Vice President Joe Biden warned Russia on Tuesday that "it's time to stop talking and start acting" to reduce tension in Ukraine, offering a show of support for the besieged nation as an international agreement aimed at stemming its ongoing crisis appeared in doubt. (AP Photo/Sergei Grits), APTOPIX