The leaders of the United States, Britain, France and Germany discussed efforts to revive the 2015 Iran nuclear deal, the White House said on Sunday in a statement largely focused on Ukraine.

“In addition, they discussed ongoing negotiations over Iran’s nuclear program, the need to strengthen support for partners in the Middle East region, and joint efforts to deter and constrain Iran’s destabilizing regional activities,” the White House said in its description of the call among the four.