President Donald Trump’s approach to ending Russia’s war against Ukraine has left European allies and Ukrainian officials worried they are being largely sidelined by the new U.S. administration as Washington and Moscow plan direct negotiations.

The Monday meeting in Saudi Arabia follows on the heels of the U.S. president’s call last week with Vladimir Putin.

European leaders are gathering in France for an emergency summit on Ukraine after the Trump administration announced it was opening talks with Russia on ending the war without a European presence.