What chemical weapons stockpile limits did the United States and Soviet Union agree to in 1990?

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American soldiers in World War I uniforms, some wearing gas masks, advance with rifles during a simulated gas attack exercise on a rocky battlefield. — chemical weapon American soldiers participating in a simulated gas attack exercise, World War I.

In 1990, as part of a series of bilateral negotiations to reduce their respective chemical weapons arsenals, the United States and the Soviet Union reached an agreement to limit each state to a maximum of 5,000 tons of chemical agents.1

This agreement marked a significant step toward the eventual total ban and dismantling of chemical stockpiles established by the Chemical Weapons Convention, which was adopted in 1992 and entered into force in 1997.1