Dec. 2 (UPI) -- Russian President Vladimir Putin was due to hold talks on Ukraine on Tuesday with U.S. special envoy Steve Witkoff and Jared Kushner, President Trump's son-in-law, amid a renewed push by the White House to end the war.

Witkoff brought with him a revised version of a 28-point peace plan first floated by Trump in the middle of November, seen as being strongly weighted in Moscow's favor. The new plan was drawn up by U.S. officials in consultation with Ukraine and European diplomats.

Kremlin spokesman Dmitri Peskov said Tuesday's summit, due to get underway at around 5 p.m. local time, would be for "as long as necessary," but with mounting progress on the frontline of the war in recent days, Moscow has been openly signaling it believes it will succeed with or without a deal.

The Kremlin visit, Witkoff's sixth in 10 months, came after U.S.-Ukrainian negotiations over the weekend in Miami ended inconclusively, with the parties saying they had gone well but that more work was needed to resolve outstanding issues.

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