"Ukraine doesn't want to resolve all the issues," he said.
"If you agree to resolve something, then you need to act and move forward, and resolve everything that's included.
"If that doesn't happen, then the Minsk Agreement is unfulfilled, and it renders all the meetings in Minsk pointless," he added.
He also accused Kiev of preparing for war - a charge it denies.
"According to the information we've received, Kiev could once again provoke the conflict very soon, attacking Donetsk or any another town of the Donetsk People's Republic."
Our analyst Robert Coalson notes that no one seems to have picked up on the fact that Putin spokesman Dmitry Peskov on Friday characterized U.S. "instructors or specialists" in Ukraine as indicative of the "participation of...third countries" -- inviting the question, in a conflict that Moscow has consistently described as a Ukrainian civil war and in which Putin just this week insisted his country has no troops, of who, exactly, is the "second country" in his assumption.
Kuleba is a spokesman for the Ukrainian Foreign Ministry.
