President Donald Trump is set to hold talks with Russian President Vladimir Putin as he looks to get buy-in on a U.S. ceasefire proposal that he hopes can create a pathway to ending Russia’s devastating war on Ukraine.

The engagement is just the latest turn in dramatically shifting US-Russia relations as Trump has made quickly ending the conflict a top priority, even at the expense of straining ties with longtime American allies who want Putin to pay a price for the invasion.

The high-stakes call will serve as a test of Trump's touted deal-making skills and of his prized relationship with the Russian leader, which has left traditional U.S. allies wary. "Many elements of a Final Agreement have been agreed to, but much remains," Trump said in a social media post on Monday.