Able Archer 83 was a military exercise conducted by NATO that took place in November 1983, as part of the annual Able Archer exercise. It simulated a period of heightened nuclear tensions between NATO
A KGB report from 1981 reporting that the KGB had "implemented measures to strengthen intelligence work in order to prevent a possible sudden outbreak of war by the enemy". To do this, the KGB "actively obtained information on military and strategic issues, and the aggressive military and political plans of imperialism [the United States] and its accomplices", and "enhanced the relevance and effectiveness of its active intelligence abilities".