Japan's 700,000 Abandoned Chemical Weapons in China Miss 4 Deadlines

When Japanese forces retreated from China at the end of World War II, they abandoned an estimated 700,000 chemical weapons -- projectiles, mortars, aerial bombs, liquid-filled drums, and gas-filled pots containing mustard gas and other agents -- scattered across more than 90 sites in Chinese territory. Under the Chemical Weapons Convention, Japan accepted responsibility for destroying these weapons. The original deadline was 2007. It has been extended four times, and as of 2024, approximately 105,000 of over 127,000 declared items have been destroyed, but the full scope remains unknown because new caches keep being discovered. The human cost of delay is direct and ongoing. Chinese civilians -- farmers, construction workers, children playing near abandoned sites -- continue to be injured by encounters with corroded munitions that leak agent. Each year of delay means another year that unstable, deteriorating chemical shells sit in populated areas of northeastern China. The geopolitical tension is also significant: China has repeatedly and publicly criticized Japan for insufficient investment and attention, and the issue poisons bilateral relations in ways that extend far beyond disarmament. Every delayed deadline reinforces Chinese perceptions that Japan does not take responsibility for its wartime conduct seriously. The structural reasons for the slow pace are a combination of technical difficulty and diplomatic friction. Many weapons are deeply buried, mixed with conventional ordnance, or submerged in waterlogged soil that complicates excavation. Japan funds and operates the destruction facilities, but China controls access to the sites, and coordination between two governments with fundamentally different political systems and deep historical grievances is inherently slow. The OPCW oversees the process but cannot compel either side to move faster. The 2027 target for completion is widely considered optimistic given the discovery rate of new caches.