Related Clues:
- Former superpower's letters
- Initials on a cosmonaut's helmet, once
- Cyrillic USSR
- State led by Lenin, in brief
- Allegiance of "The Americans" on TV, ironically
- CCCP, to the West
- Space Race inits
- MiG developer
- Defunct Asian country, briefly
- Setting of HBO's 'Chernobyl'
- Cold War nation: Abbr
- Space Race rival of the U.S
- Bloc letters until 1991
- Letters on a cosmonaut's space suit
- Letters on cosmonauts' helmets, once