Not for the first time, European capitals are gripped with apprehension that Russian President Vladimir Putin will surgically divide the transatlantic alliance as well as get everything he wants in Ukraine.

Polish Prime Minister Donald Tusk said that the U.S. had pledged to consult with Europe ahead of a summit with Russia's Vladimir Putin, as European ministers prepare for discussions amid fears Washington may dictate unfavourable peace terms to Ukraine.

President Trump has been pushing to broker an end to the war in Ukraine since he took office. But it hasn't been quick or easy.