Russia has the most nuclear weapons in the world, with an estimated 5,977 nuclear warheads. The United States follows closely behind with an estimated 5,428 nuclear weapons. China has the third-largest nuclear arsenal, with an estimated 350 nuclear weapons. France, the United Kingdom, Pakistan, India, Israel, and North Korea also possess nuclear weapons, with North Korea having the smallest arsenal of around 20 nuclear weapons. Together, these nine countries possess roughly 12,500 nuclear warheads, with the majority owned by Russia and the United States.