Russia said no progress was made during talks with Ukraine in Berlin on Thursday.
Foreign policy advisers from Germany, France, Russia and Ukraine held nearly nine hours of talks in Berlin on Thursday to try to revive the stalled agreement but made no progress.
Russian representative Dmitry Kozak said Ukraine firmly refused to commit to a dialogue with the rebels on a political settlement, blocking any further movement.
Ukrainian envoy Andriy Yermak sounded a more positive note, noting that the parties agreed to continue their discussions and hailed the four-way talks as an "effective and efficient platform."
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The Berlin talks were part of renewed diplomatic efforts to resolve the biggest security crisis between Russia and the West since the Cold War. U.S. Secretary of State Antony Blinken has met Lavrov in Geneva, while French President Emmanuel Macron met Putin in Moscow before heading to Kyiv this week.