US Secretary of State Marco Rubio projected optimism on Sunday after what he described as productive discussions between American and Ukrainian officials in Geneva, Switzerland, aimed at stopping the war in Ukraine.

Marco Rubio says Ukraine war discussions have entered productive phase as negotiators refine comprehensive peace plan covering ceasefire and settlement terms.

The United States and Ukraine said they had created an "updated and refined peace framework" to end the war with Russia that apparently modified an earlier plan drafted by the Trump administration which Kyiv and its allies saw as too sympathetic to Moscow.

Polish Prime Minister Donald Tusk said “it would be good to know for sure who is the author of the plan,” as tensions over elements that mirror long-standing Russian demands.

As for Mr Trump, he again betrayed his underlying bias: sympathy for Russia and indifference to Ukraine. Ahead of the Geneva talks he dismissively said Mr Zelensky “can continue to fight his little heart out” if no agreement were reached, and complained on social media that “UKRAINE ‘LEADERSHIP’ HAS EXPRESSED ZERO GRATITUDE FOR OUR EFFORTS.”

U.S., Ukrainian and European officials gathered in Switzerland on Sunday for talks on the contentious American-Russian peace plan put to Kyiv this week.

Top European and Ukrainian envoys have met in Geneva ahead of talks with U.S. Secretary of State Marco Rubio about President Donald Trump's proposal to end Russia’s war on Ukraine.

The president also took aim at former President Joe Biden, arguing that Putin only attacked Ukraine because Biden was president at the time.