U.S. and European officials have spoken to the Ukrainian government about what possible peace negotiations with Russia might entail to end the war, NBC quoted an unidentified senior U.S. official and one former U.S. official as saying.

The war in Ukraine, now in its 21st month, has killed or wounded hundreds of thousands and destroyed swathes of the country. It has also triggered the deepest crisis in Moscow’s relations with the West since the 1962 Cuban Missile Crisis.

NBC said the conversations had included very broad outlines of what Ukraine might need to give up to reach a deal with Russia.

Reuters was not able to independently verify the conversations reported by the U.S. television network.

Asked on Saturday about the NBC report, Ukraine’s President Volodymyr Zelenskiy reaffirmed his stance that this was not the time to negotiate with Russia, and he also denied that any Western leaders were pressuring him to do so.