Ukrainian President Volodymyr Zelenskyy has arrived at the White House, bringing with him an extraordinary cadre of European leaders with him to show U.S. President Donald Trump a united front against Russia. Ukraine’s future could hinge on a hastily assembled meeting Monday at the White House. The European political heavy-hitters were left out of Trump’s summit with Russian President Vladimir Putin last Friday in Alaska, and they're looking to safeguard Ukraine and the continent from any widening aggression from Moscow. Monday’s showing is a sign both of the progress and the possible distress coming out of the Friday summit, as many of Europe’s leaders are descending on Washington with the explicit goal of protecting Ukraine’s interests, a rare and sweeping show of diplomatic force. Zelenskyy wore a black shirt with buttons and a black blazer. The last time he was at the White House, his casual clothing became a point of irritation for Trump.