Washington DC - President Donald Trump said Friday that he was sending envoys Jared Kushner and Steve Witkoff to Moscow and Kyiv with a proposal to end the four-year-old Ukraine war.

"They're bringing with them a proposal to end the war," Trump told reporters when asked about this weekend's trip by his son-in-law Kushner and businessman friend Witkoff.

Trump would not say whether the plan involved Ukraine ceding territory as he has previously suggested, but added: "We have an idea for peace."

It will be the first time that Kushner and Witkoff have visited war-torn Kyiv since Trump returned to office last year with a vow to end the Ukraine war.

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Both US envoys have previously visited Moscow.

"I sent Steve Witkoff and Jared Kushner, two great negotiators," he said.

"They've done a great job, and we sent them over to see whether or not we can get something done. And there may be a good chance that we'll do it."

The US leader blamed the war that began with Russia invading Ukraine in February 2022 on a "personality problem" between Russian President Vladimir Putin and Ukrainian President Volodymyr Zelensky.

Zelensky earlier said he had proposed observing a ceasefire with Russia while the US envoys visit Moscow and Kyiv.

"There will be no airstrikes on our part, and Russia must reciprocally ensure a ceasefire – without its own airstrikes – for the duration needed to conduct these talks," Zelensky said in his evening address.