On the campaign trail last year, Donald Trump promised to end the Russia-Ukraine war. But in the five months since taking office, the United States president has struggled to get the two sides to agree to a ceasefire.

Putin said efforts to end the war were "generally on the right track" and that Moscow was ready to work with Ukraine on a potential peace deal.

U.S. President Donald Trump is set to speak with President Vladimir Putin on Monday about ending the war in Ukraine as the Kremlin continues to unleash barrages of drone attacks on its war-torn neighbor.