President Donald Trump, who CNN reported Friday has been surprised and frustrated at the difficulty of achieving his promise of ending the war, wants Ukraine to give up territory in exchange for peace and essentially cede control of Crimea, the peninsula Russia first invaded in 2014.

The Trump administration is pursuing a ceasefire deal between Russia and Ukraine to halt the fighting after more than three years.

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.