A new meeting is expected next week in London, and Rubio suggested that could be decisive in determining whether the Trump administration continues its involvement.

Kremlin spokesman Dmitry Peskov said some progress on a peace settlement had already been made but that contacts with Washington were difficult. He said Russia was striving to resolve the conflict while ensuring its own interests. Moscow remained open to dialogue with the United States, he added.

If it is not possible to end the war in Ukraine, we need to move on,” the American secretary of state said as he departed meetings in Paris.