In a call with President Trump, President Vladimir V. Putin agreed to pause strikes on Ukrainian energy infrastructure for 30 days if Ukraine does the same. That falls short of the unconditional cease-fire Ukraine had already agreed to.

It was not immediately clear whether Ukraine would sign off on the agreement for a 30-day halt on strikes on energy and infrastructure, since Kyiv agreed last week to a more extensive U.S.-proposed ceasefire.

U.S. President Donald Trump said he would speak to Russia's Vladimir Putin on Tuesday morning about ending the Ukraine war, with territorial concessions by Kyiv and control of the Zaporizhzhia nuclear power plant likely to feature prominently in the talks.