President Donald Trump Monday held a crucial meeting with Ukraine President Volodymyr Zelenskyy and a united front of European leaders at which he agreed to consider providing security guarantees to any peace deal after his controversial Alaska summit with Russian leader Vladimir Putin.

President Donald Trump told Ukrainian President Volodymyr Zelenskyy and European leaders Monday at the White House he thinks “it’s going to be when, not if,” he and Zelenskyy hold a trilateral meeting with Russian President Vladimir Putin, suggesting such a meeting could end Russia’s three-year invasion of Ukraine.