A third issue is whether technological and scientific advances might aid the destruction of chemical weapons, particularly old and abandoned chemical weapons and those dumped in the sea. [4] This is an area where the review conference could encourage further cooperation between states-parties and the sharing of assessments, experience, and technological know-how.
During the Second Sino-Japanese War (1937–1945) Japan stored chemical weapons on the territory of mainland China. The weapon stock mostly containing mustard gas-lewisite mixture. [100] The weapons are classified as abandoned chemical weapons.