The prospect of a peaceful resolution to the war in Ukraine grew on Saturday as a top negotiator for Kyiv said Moscow largely agreed to their proposals, at least "verbally," with the draft document having reached the stage where it is to be discussed by the countries' respective leaders.

Negotiator David Arakhamia told Ukrainian television channels that any meeting between Ukraine's President Volodymyr Zelenskyy and Russian President Vladimir Putin would "with a high probability" take place in Turkey, in Istanbul or Ankara.

Russia had indicated that draft peace treaty documents were at an advanced enough stage to allow for direct consultations between the two nations' leaders, Interfax Ukraine reported quoting Arakhamia.

"The Russian Federation has given an official answer to all positions, which is that they accept the (Ukrainian) position, except for the issue of Crimea (annexed by Russia in 2014)," Arakhamia said.

He said that while there was "no official confirmation in writing," the Russian side said so "verbally."

The comments came as Ukraine said it had retaken control of the whole Kyiv region.

Arakhamia said Moscow had agreed in talks that a referendum on the neutral status of Ukraine "will be the only way out of this situation."

Asked what would happen if Ukrainians voted against a neutral status for the country, Arakhamia said "we will either return to a state of war, perhaps, or return to new negotiations."

The Kremlin has insisted that Ukraine adopt a neutral status.

Arakhamia said Turkish President Recep Tayyip Erdoğan "called both us and Vladimir Putin" Friday, saying he would host the meeting.

"Neither the date nor the place is known, but we believe that the place will most likely be Ankara or Istanbul," he said.

Turkey, which has good relations with both Russia and Ukraine, has sought to mediate the conflict.

Since Putin launched his invasion of Ukraine, Zelenskyy has repeatedly called for face-to-face talks with his Russian counterpart.