Soviet Union / Russia

A transcontinental country spanning Eastern Europe and Northern Asia, formerly the Union of Soviet Socialist Republics (USSR). Throughout the Cold War, the US military and intelligence communities often suspected UAP might be advanced Soviet technology. Conversely, declassified files reveal that the Soviets experienced their own UAP incidents and established secret military programs to study them.

The primary Cold War adversary of the US, frequently suspected of being the source of UAP, while also conducting its own secret UAP investigations.