Dominance of Russia and the United States: These two nations hold the vast majority of the world's nuclear weapons. Russia's total inventory appears to be the largest, followed closely by the United States.
Inventory Categories: The chart distinguishes between four types of warheads:
Deployed Strategic: Active warheads on long-range delivery systems.
Deployed Nonstrategic: Active shorter-range tactical weapons.
Reserve/Nondeployed: Stockpiled warheads not currently active.
Retired: Warheads slated for dismantlement.
Stockpile vs. Deployed: While total inventories are high, a significant portion (represented by the grey and light blue bars) consists of retired or reserve warheads rather than those actively deployed for immediate use.
Other Nuclear Powers: Countries like China, France, the UK, India, Pakistan, Israel, and North Korea maintain much smaller inventories compared to the "big two," with their totals typically numbering in the hundreds or dozens.