A bar chart showing estimated nuclear warhead inventories in 2025. Russia has the largest inventory, at 5.5k warheads, including 1.7k deployed, 2.6k in reserve, and 1.2k retired. The U.S. follows with 5.2k, including 1.8k deployed, 1.9k in reserve, and 1.5k retired. China follows far behind at 600 warheads.