Castel Gandolfo, Italy - Pope Leo XIV on Tuesday called for a global truce on Christmas Day, expressing "great sadness" that "apparently Russia rejected a request" for one.

"I am renewing my request to all people of goodwill to respect a day of peace – at least on the feast of the birth of our Saviour," Leo told reporters at his residence in Castel Gandolfo near Rome.

Russia invaded Ukraine in February 2022 and has repeatedly rejected calls for a ceasefire, saying it would only give a military advantage to Ukraine.

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"Among the things that cause me great sadness is the fact that Russia has apparently rejected a request for a truce," the pope said.

Referring to conflicts in general, Leo said: "I hope they will listen and there will be 24 hours of peace in the whole world," he added.

Ukraine on Tuesday pulled out troops from a town in the east of the country after fierce battles with Russian forces, as relentless strikes by Moscow killed three civilians and cut power to thousands in freezing winter temperatures.

There was no sign of an imminent breakthrough after top negotiators from both Russia and Ukraine were in Miami last weekend for separate meetings with US officials seeking a deal to end almost four years of fighting.

Pope Leo met with Ukrainian President Volodymyr Zelensky earlier this month.

Asked if he would accept Zelensky's invitation to visit Ukraine, Leo later said "I hope so", but cautioned it was not possible to say when such a trip would be possible.

He also said that seeking peace in Ukraine without European diplomatic involvement was "unrealistic" and warned US President Donald Trump's proposed peace plan risked a "huge change" in the transatlantic alliance.