Organisationally, there were two main PVO districts for most of the USSR's postwar history, Moscow and Baku, and the rest of the country was divided into PVO regions like in Belarus, the Ukraine, the Baltics and Central Asia.
Organisationally, there were two main PVO districts for most of the USSR's postwar history, the Moscow Air Defence District (formed 1950) and Baku (formed 1954). The rest of the country was initiallt divided into PVO regions covering Belarus, the Ukraine, the Baltics and Central Asia.