Ukraine and European leaders agreed on Saturday to an unconditional 30-day ceasefire starting Monday with the backing of President Donald Trump, threatening President Vladimir Putin with new "massive" sanctions if he failed to comply.

Since retaking office, Trump has veered dramatically from Europe’s stance on the conflict, blaming Ukraine for starting the war, temporarily withholding intelligence from Kyiv and threatening to pull military support, as well as hinting that he would withdraw from the Nato military alliance altogether.