Joe Biden

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U.S. Vice President Joe Biden addresses members of the Ukrainian parliament during a meeting Tuesday, April 22, 21014 in Kiev. Biden's visit to Ukraine comes at a crucial time, days after an international agreement was reached aimed at quelling violence in Ukraine. (AP Photo/Sergei Supinsky, Pool)

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Masked pro-Russian gunmen guard an entrance of the Ukrainian regional office of the Security Service with a Russian National flag is in background in Luhansk, Ukraine, Monday, April 21, 2014. U.S.Vice President Joe Biden is heading to Ukraine to meet with leaders of the turbulent country. Biden's visit comes a day after violence erupted in eastern Ukraine, despite an agreement last week aimed at easing tensions.(AP Photo/Alexander Zemlianichenko)

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U.S. Vice President Joe Biden , left, is greeted upon arrival at Borispol airport outside Kiev, Ukraine, Monday April 21, 2014. U.S. Vice President Joe Biden will meet with Ukraine's acting president, Oleksander Turchinov, and Prime Minister Arseny Yatseniuk on Tuesday, during a visit to Kiev. (AP Photo/Sergei Chuzavkov)

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U.S. Vice President Joe Biden waves as he arrives at Borispol airport outside Kiev, Ukraine on Monday April 21, 2014. Vice President Joe Biden on Monday launched a high-profile visit to demonstrate the U.S. commitment to Ukraine and push for urgent implementation of an international agreement aimed at de-escalating tensions even as violence continues. Biden planned to meet Tuesday with government leaders who took over after pro-Russia Ukrainian President Viktor Yanukovych was ousted in February following months of protests. The White House said President Barack Obama and Biden agreed he should make the two-day visit to the capital city to send a high-level signal of support for reform efforts being pushed the new government. (AP Photo/Sergei Chuzavkov)

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U.S. Vice President Joe Biden waves as he arrives at Borispol airport outside Kiev, Ukraine on Monday April 21, 2014. Vice President Joe Biden on Monday launched a high-profile visit to demonstrate the U.S. commitment to Ukraine and push for urgent implementation of an international agreement aimed at de-escalating tensions even as violence continues. Biden planned to meet Tuesday with government leaders who took over after pro-Russia Ukrainian President Viktor Yanukovych was ousted in February following months of protests. The White House said President Barack Obama and Biden agreed he should make the two-day visit to the capital city to send a high-level signal of support for reform efforts being pushed the new government. (AP Photo/Sergei Chuzavkov)