The Washington Naval Conference was a disarmament conference called by the United States and held in Washington, D.C., from November 12, 1921, to February 6, 1922. It was conducted outside the auspices of the League of Nations. It was attended by nine nations regarding interests in the Pacific Ocean and East Asia. Germany was not invited to the conference, as restrictions on its navy had already been set in the Versailles Treaty. Soviet Russia was also not invited to the conference. It was the first arms control conference in history, and is still studied by political scientists as a model for a successful disarmament movement.