"Now is the moment to bring an end to the senseless killing," Trump said in a message published by Zelensky on Sunday.

Russia meanwhile said power and energy facilities had been targeted overnight by Ukraine, which has not commented.

Russia has accused Ukraine of drone strikes that sparked a fire at a nuclear power plant in the Kursk region Sunday as Kyiv marked its national Independence Day.

Volodymyr Zelensky urges Western allies to impose fresh sanctions on Moscow if it shows no interest in peace.

Russia’s top diplomat said in an interview released on Friday that “there is no meeting planned” between President Vladimir V. Putin of Russia and President Volodymyr Zelensky of Ukraine. It was the Kremlin’s most direct declaration yet that a summit the White House suggested was imminent was nowhere close to materializing.

President Trump said in a social media post Monday that he had spoken to Russian President Vladimir Putin and set in motion arrangements for a summit at a location to be decided.