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.

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