Nuclear sharing

The Quint is an informal decision-making group consisting of the United States and the Big Four of Western Europe (France, Germany, Italy and the United Kingdom). All the countries forming it are allies and members of NATO, the OECD and the G7/G20.

The United States, France and the United Kingdom are nuclear-weapon states, while Germany and Italy are part of the nuclear weapons sharing program.

The Russian Federation is known to possess or have possessed three types of weapons of mass destruction: nuclear weapons, biological weapons, and chemical weapons. It is one of the five nuclear-weapon states recognized under the Treaty on the Non-Proliferation of Nuclear Weapons and one of the four countries wielding a nuclear triad. Russia has been alleged to violate the Biological Weapons Convention and Chemical Weapons Convention.

As of 2025, Russia's triad of deployed strategic nuclear weapons includes approximately 1,254 intercontinental ballistic missiles, 992 submarine-launched ballistic missiles, and 586 cruise missiles or bombs for delivery by Tupolev Tu-160 and Tu-95 bombers. It also possesses the world's largest arsenal of tactical nuclear weapons, approximately 1,500. Since 2022, Russia has provided tactical nuclear weapons to Belarus.

21°13′42.8″S 159°46′35.5″W / 21.228556°S 159.776528°W / -21.228556; -159.776528

The Treaty of Rarotonga is the common name for the South Pacific Nuclear Free Zone Treaty, which formalises a nuclear-weapon-free zone in the South Pacific. The treaty bans the use, testing, and possession of nuclear weapons within the borders of the zone.

Since 2023, Russia has claimed to have stationed nuclear weapons in Belarus. As of 2025, there is no conclusive open-source evidence that Russian nuclear warheads and gravity bombs themselves are being stored in Belarus. If they are, the most likely location is a Cold War-era depot near Asipovichy. Russia has also provided nuclear delivery systems and training to Belarusian forces in the form of Iskander-M short-range ballistic missiles and modification and training for Sukhoi Su-25 aircraft and crews to employ nuclear gravity bombs.

Belarus joined the Treaty on the Non-Proliferation of Nuclear Weapons as a non-nuclear-weapons-state in 1994.

The nuclear weapons of the United States comprise the second-largest arsenal in the world, behind Russia. The US is only country to have used nuclear weapons in warfare, in the atomic bombings of Hiroshima and Nagasaki at the end of World War II. The Manhattan Project, begun in 1942, made the US the first nuclear-armed country. The US operates a nuclear triad. The US previously possessed chemical and biological weapons. It is a ratifier of the nuclear Non-Proliferation Treaty, Biological Weapons Convention, and Chemical Weapons Convention.

As of 2025, the United States actively deploys approximately 1,770 warheads, mostly under Strategic Command, to its nuclear triad. Of these, 970 warheads on Trident II submarine-launched ballistic missiles aboard to Ohio-class submarines with, 400 warheads to silo-based Minuteman III intercontinental ballistic missiles, and 300 bombs and cruise missiles to B-2 Spirit and B-52 Stratofortress bombers. The US also forward deploys nuclear weapons in the form of approximately 100 B61 bombs in six European NATO countries: Belgium, Germany, Italy, the Netherlands, Turkey, and United Kingdom. The US warhead inventory totals 5,177 warheads, with 1,930 warheads for reserve use, and another 1,477 awaiting dismantlement.