US President Donald Trump and Russian President Vladimir Putin spoke by phone Wednesday and agreed to immediately start talks to end the Ukraine war, in an extraordinary thaw in relations that could leave Kyiv out in the cold.

Trump described the call as "lengthy and highly productive" in a post on Truth Social, saying the two leaders had also agreed to visit each other to address the deep tensions since Russia's 2022 invasion of Ukraine.

The Kremlin said the call lasted nearly one-and-a-half hours and that Putin and Trump had agreed that the "time has come to work together".