April 2021 New START declaration: 1,456 strategic warheads deployed on 517 intercontinental ballistic missiles, submarine-launched ballistic missiles, and strategic bombers
The Federation of American Scientists (FAS) estimates approximately 4,495 nuclear warheads, including 1,625 deployed offensive strategic warheads (with 960 in storage), 1,910 non-strategic warheads, and 1,760 additional retired warheads awaiting dismantlement, as of January 2021.
United Kingdom:
About 225 strategic warheads, of which an estimated 120 are deployed and 105 are in storage. The United Kingdom possesses a total of four Vanguard-class Trident nuclear-powered ballistic missile submarines, which together form its exclusively sea-based nuclear deterrent.
