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Vice President Joe Biden has reiterated US support for a unified Ukraine during a meeting with MPs in Kiev.
Mr Biden announced new technical support at the Ukraine parliament in a show of support for the interim government.
US experts will also work on reducing Ukraine's dependence on Russian gas as well as fighting corruption.
He also warned Russia against further provocative action after an agreement in Geneva last week.
"Act on the commitment that they made to get pro-Russian separatists to vacate buildings and checkpoints, except amnesty and address their agreements politically."
His visit comes as on Easter Sunday, at least three people were killed at a checkpoint manned by armed separatists, with Russia blaming Ukrainian nationalist group Right Sector.
Pro-Russian separatists show no sign of surrendering government buildings seized in the predominantly Russian speaking east.