Washington is unhappy that some European arms programs limit U.S. participation.

U.S. Deputy Secretary of State Christopher Landau on Wednesday slammed European NATO allies for prioritizing their own defense industry over American arms suppliers, according to three NATO diplomats.

The intervention came during Wednesday’s meeting of NATO foreign ministers — which was skipped by Landau’s boss Marco Rubio.

Landau, a longtime NATO skeptic who spoke first at the closed-door meeting, told ministers not to “bully” his country’s defense firms out of participating in Europe’s rearmament.