As US Vice President Joe Biden began a two-day visit to Kiev -- a pointed show of American backing for Ukraine's new leaders -- Washington and Moscow each put a radically different spin on a crunch telephone call between their diplomatic chiefs on reviving the accord reached last week in Geneva.
Under the deal, signed by Ukraine, Russia, the United States and the European Union, pro-Kremlin rebels holding a string of eastern towns were supposed to disarm and give up the buildings they have seized.
US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov each urged the other to put pressure on his side in the crisis -- in Kerry's case, on the Ukrainian government, which Moscow accused of "grossly breaching" the Geneva deal; in Lavrov's, on the separatist rebels, which Washington sees as backed by Russia.
Kerry told Lavrov that "concrete steps" to defuse the crisis should include "publicly calling on separatists to vacate illegal buildings and checkpoints, accept amnesty and address their grievances politically", said State Department spokeswoman Jen Psaki.
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Lavrov also accused Ukraine's government of an "inability and unwillingness" to rein in Pravy Sektor ("Right Sector"), an ultra-nationalist group the separatists blamed for an attack today on one of their checkpoints in the flashpoint town of Slavyansk.
The shootout, started by unidentified attackers, broke a brief Easter truce and killed at least two separatist rebels.
US President Barack Obama has threatened more sanctions on Moscow if the Geneva accord is not implemented soon, beyond those already imposed by the United States and the European Union.