Of the nine nuclear powers—five official and four unofficial or unacknowledged—the United States is the only one known to deploy nuclear weapons on the territory of other countries, with an estimated 180-200 nuclear gravity bombs based in Europe. Russian Foreign Minister Sergey Lavrov, in remarks to the Conference on Disarmament in Geneva on Feb. 24, called on the U.S. to bring those weapons home. “We consider it unacceptable for NATO to maintain its ‘joint nuclear missions,” which contradict the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), he said. “American nuclear weapons must be returned to U.S. territory, and the foreign infrastructure for their deployment must be eliminated.”