President Trump and European leaders met for a one-of-a-kind summit at the White House on Monday to push toward a peace deal between Russia and Ukraine. But by the end of a marathon day of meetings, details on what such an agreement might entail remained elusive.

During a meeting with European leaders on a potential ceasefire deal in the Russia-Ukraine war, President Donald Trump said the day has been successful and a peace agreement between the countries is “attainable.