The International Atomic Energy Agency declared on Thursday that Iran was not complying with its nuclear nonproliferation obligations, the first time the United Nations’ watchdog has passed a resolution against the country in 20 years.

The long-anticipated vote by the agency’s board of governors in Vienna came at a time of high tension over Iran’s nuclear program, with American and European officials saying they believe that Israel may be preparing an imminent military strike against Iran.

The watchdog also said that Iran had consistently failed to provide information about undeclared nuclear material and activities at multiple undeclared locations.

The resolution was put forward by the United States, Britain, France and Germany, and it passed easily, with 19 votes of the 35-nation board. Russia, China and Burkina Faso voted against it, and 11 other countries abstained, while two did not vote at all.

Iran had reacted angrily to the prospect of the vote and had threatened to leave the Nuclear Nonproliferation Treaty altogether. But the vote was also seen as part of the diplomacy around the fraught negotiations on Iran’s nuclear program between the United States and Iran.

This is a developing story. Check back later for updates.