WASHINGTON (AP) — Ukraine’s future could hinge on a hastily assembled meeting Monday at the White House as Ukrainian President Volodymyr Zelenskyy brings with him an extraordinary cadre of European leaders to show U.S. President Donald Trump a united front against Russia.

The European political heavy-hitters were left out of Trump’s summit with Russian President Vladimir Putin last Friday, and they’re looking to safeguard Ukraine and the continent from any widening aggression from Moscow.

By arriving as a group, they hope to avoid any debacles like Zelenskyy’s February meeting in the Oval Office, where Trump chastised him for not showing enough gratitude for American military aid. The meeting also is a test of America’s relationship with its closest allies after the European Union and the United Kingdom accepted Trump’s tariff hikes partly because they wanted his support on Ukraine.

Monday’s showing is a sign of the progress and the possible distress coming out of the Alaska meeting as many of Europe’s leaders descend on Washington with the explicit goal of protecting Ukraine’s interests, a rare and sweeping show of diplomatic force.

“It’s important that America agrees to work with Europe to provide security guarantees for Ukraine, and therefore for all of Europe,” Zelenskyy said on X.