The leaders of the three nations say in a statement Tuesday that they’ve been “left with no choice, given Iran’s actions, but to register today our concerns that Iran is not meeting its commitments.″

A U.N. agency says Iran is no longer in violation of its nuclear agreement with six world powers because it has reduced its store of heavy water.

World powers and Iran have reached tentative agreement on sanctions relief for the Islamic Republic, among the most contentious issues in a long-term nuclear agreement.