"It is time to agree on an end to the conflict, and we are ready for the necessary decisions during a new summit of the leaders of the four countries," Zelenskiy said in a statement.

In the same statement, Zelenskiy's chief of staff Andriy Yermak said Ukraine wanted to agree on measures such as implementing a ceasefire and more prisoner swaps.

Washington and Kyiv say tens of thousands of Russian troops moved to within striking distance of Ukraine could be preparing a new military offensive. Officials from the United States and Russia met for talks in Geneva on Monday. read more

Reporting by Pavel Polityuk; editing by Matthias Williams