Their meeting on Sunday was preceded by massive air strikes by Russia on Ukraine and by Kyiv on Moscow’s oil refinery, showing how fragile Trump’s peace initiative is.

Trump also introduced a note of caution about the prospects of peace that has eluded his diplomacy, telling reporters before their meeting at his Mar-a-Lago estate in Florida, “It’s possible it doesn’t happen (and) in a few weeks, we’ll know one way or another”.

The negotiation would continue, all sides agreed.

Volodymyr Zelenskyy wrote on X that the US-Ukraine teams would meet “as early as next week to finalise all discussed matters” and Trump will hold a meeting with Ukrainian and European leaders in Washington next month.

A Kremlin spokesperson, Yury Ushakov said that the US would continue its through two working groups -- one on security issues, and the other on economic matters – and their terms will be finalised "most likely in early January.”