Weapons administration

In this photo released by the official website of the office of the Iranian Presidency, President Hassan Rouhani speaks in a public gathering at the city of Yazd, some 410 miles (680 kilometers) southeast of the capital Tehran, Iran, Sunday, Nov. 10, 2019. Iran has discovered a new oil field in the country's south with over 50 billion barrels of crude oil, Rouhani said Sunday, a find that could boost the country's proven reserves by a third as it struggles to sell energy abroad over U.S. sanctions. (Office of the Iranian Presidency via AP)

FILE - In this March 6, 2012, file photo, an FBI poster showing a composite image of former FBI agent Robert Levinson, right, of how he would look like now after five years in captivity, and an image, center, taken from the video, released by his kidnappers, and a picture before he was kidnapped, left, displayed during a news conference in Washington. Iran is acknowledging for the first time it has an open case before its Revolutionary Court over the 2007 disappearance of a former FBI agent on an unauthorized CIA mission to the country. In a filing to the United Nations, Iran said the case over Robert Levinson was "on going," without elaborating. The Associated Press obtained the text of the filing Saturday, Nov. 9, 2019. (AP Photo/Manuel Balce Ceneta, File)

Thomas Zerzecki, an envoy for the U.S. State Department's Bureau of International Security and Nonproliferation attends a meeting with Serbian Foreign Minister Ivica Dacic, in Belgrade, Serbia, Friday, Nov. 8, 2019. Serbia's foreign minister has expressed hope that the U.S. won't introduce sanctions against the Balkan country as he met a U.S. official in charge of embargo against the states which purchase weapons from Russia. (AP Photo/Darko Vojinovic)

Russian Foreign Minister Sergey Lavrov speaks during a joint news conference with Greek Foreign Minister Nikos Dendias following their talks in Moscow, Russia, Wednesday, Nov. 6, 2019. Lavrov and Dendias spoke for closer cooperation between Russia and Greece. (AP Photo/Alexander Zemlianichenko)

This photo released on Tuesday, Nov. 5, 2019 by the Atomic Energy Organization of Iran shows centrifuge machines in Natanz uranium enrichment facility in central Iran. Iran announced on Monday that had started gas injection into a 30-machine cascade of advanced IR-6 centrifuges in Natanz complex. (Atomic Energy Organization of Iran via AP)

Iran's Ambassador to the International Atomic Energy Agency, IAEA, Gharib Abadi, waits for the start of the IAEA board of governors meeting at the International Center in Vienna, Austria, Thursday, Nov. 7, 2019. (AP Photo/Ronald Zak)

Iran's Ambassador to the International Atomic Energy Agency, IAEA, Gharib Abadi, waits for the start of the IAEA board of governors meeting at the International Center in Vienna, Austria, Thursday, Nov. 7, 2019. (AP Photo/Ronald Zak)

This photo released on Tuesday, Nov. 5, 2019 by the Atomic Energy Organization of Iran shows centrifuge machines in Natanz uranium enrichment facility in central Iran. Iran announced on Monday that had started gas injection into a 30-machine cascade of advanced IR-6 centrifuges in Natanz complex. (Atomic Energy Organization of Iran via AP)