Rubio: It's time for concrete proposals to end the war in Ukraine, US will withdraw if there is no progress

US Secretary of State Marco Rubio said on Monday that now is the time for concrete proposals from Moscow and Kiev to end the war in Ukraine and warned that the United States would withdraw as a mediator if there was no progress, State Department spokeswoman Tammy Bruce said, Reuters reports.

"We are now at a point where the two sides need to make concrete proposals on how to end this conflict," Bruce said, quoting Rubio's statement.

"How we proceed is a decision that now belongs to the president. If there is no progress, we will withdraw as mediators in this process," Bruce added, referring to US President Donald Trump, who has sought to secure a deal to end the conflict in Ukraine.

Bruce told reporters at a briefing that the US is seeking "a complete, permanent ceasefire and an end to the conflict", not "a three-day moment so you can celebrate something else".

Russian President Vladimir Putin on Monday declared a three-day ceasefire in the war with Ukraine to mark the 80th anniversary of the victory of the Soviet Union and its allies in World War II, in a move that appeared to be intended to signal that Russia is still interested in peace, according to Reuters.

Ukraine has questioned why Moscow would not agree to its call for a ceasefire lasting at least 30 days and starting immediately.

Kremlin spokesman Dmitry Peskov rejected Kiev's proposal to extend the unilateral three-day ceasefire, announced by Russian President Vladimir Putin for the beginning of May, to 30 days.

Both Kiev and Moscow have sought to show Trump they are moving toward a quick peace deal after the United States threatened to back down from its push for peace. The Trump administration has grown impatient with the stalled peace efforts, Reuters reports.

Since taking office in January, Trump has shifted US policy toward the war, pressuring Ukraine to agree to a ceasefire while easing pressure on Russia, which launched a full-scale invasion of its neighbor in 2022.

Ukrainian and European officials rejected some U.S. proposals last week on how to end Russia's war in Ukraine, presenting counterproposals on issues ranging from territory to sanctions, according to full texts of the proposals seen by Reuters.