US President Donald Trump warned Monday he would "not put up" much longer with Volodymyr Zelensky's stance on the war with Russia, as the Ukrainian leader countered he wanted to end it "as soon as possible." In a new sign of frayed ties following their White House blow-up last week, Trump called a comment by Zelensky saying an agreement to end the war remained distant "the worst statement that could have been made" by him. "America will not put up with it for much longer," Trump said on social media.

The comment came after the Ukrainian president accused Russia of not being serious about peace and warned that tough security guarantees were the only way to end the more than three-year conflict.

Trump's attacks on Zelensky have upended US support for Ukraine and Washington's allies more broadly and stoked concern about the United States pivoting to Russia.

After weekend crisis talks in London, Britain and France are investigating how to propose a one-month truce "in the air, at sea and on energy infrastructure" to halt the war.