Russia’s war on Ukraine may be entering a pivotal moment. President Donald Trump, who CNN reported Friday has been surprised and frustrated at the difficulty of achieving his promise of ending the war,

Trump said Saturday that he doubts Russia’s Vladimir Putin wants to end his war in Ukraine, expressing new skepticism that a peace deal can be reached soon.

KYIV, Ukraine (AP) — President Donald Trump said in an interview published on Friday that “Crimea will stay with Russia,” the latest example of the U.S. leader pressuring Ukraine to make concessions to end the war while it remains under siege.