U.S. President Donald Trump told Ukraine's president on Tuesday that he hoped to see a resolution to the country's crisis but stopped short of publicly endorsing a 2015 accord calling for Russia's exit from eastern Ukraine.

Trump sat down in the Oval Office with Ukrainian President Petro Poroshenko for talks that were officially called a drop-by visit after the Ukrainian leader's separate session with Vice President Mike Pence.

With TV cameras rolling, Trump said "a lot of progress has been made" between the two countries and that the two had "very, very good discussions."