European leaders urged US President Donald Trump on Wednesday not to strike a unilateral Ukraine peace deal with his Russian counterpart Vladimir Putin during their one-on-one meeting later this week in Alaska.

European leaders said a call with President Donald Trump was unifying and that he agreed Ukraine should be part of any negotiations over territory, but some still worry he could give in to Russian President Vladimir Putin.

U.S. leader told his European peers that he wouldn’t negotiate territorial issues during Friday’s meeting in Alaska but seek an immediate cease-fire instead.