Ukraine said Thursday it was ready to hold more talks with Russia in Istanbul next week but again demanded that Moscow supply a document setting out its conditions for peace.

And as the United Nations said that hopes for peace in the three-year-old war were "barely" alive, the United States again warned that it could withdraw from mediation efforts and impose sanctions on Russia.

Ukraine spoke out after Russia said Thursday it was still waiting for its rival to commit to new talks in Istanbul on Monday.

"Ukraine is ready to attend the next meeting, but we want to engage in a constructive discussion. This means it is important to receive Russia's draft," President Volodymyr Zelensky's chief of staff, Andriy Yermak, said in a statement in response.

It was not immediately clear whether the statement was setting an official condition for attending the talks.

While diplomatic efforts to end the war have gained pace in recent months, Russia has maintained an intense bombardment of Ukraine and rebuffed calls for an immediate ceasefire.

Moscow has offered to hold a second round of direct talks in Istanbul on........

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