UKRAINE-RUSSIA-POLITICS-CRISIS

A convoy of cars carrying US Vice President Joe Biden drives after Biden's arrival at the Boryspil airport in Kiev on April 21, 2014. US Vice President Joe Biden arrived in Kiev on April 21 in a show of support for the pro-Western government, as Russia accused Ukraine of reneging on an international accord meant to defuse tensions over its separatist east. Biden's two-day visit comes with the clock ticking on a White House warning of further sanctions against Moscow if it fails to implement the agreement hammered out last Thursday in Geneva with Ukraine, the United States and the European Union. AFP PHOTO/ SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP via Getty Images)