We have one possible crossword answer and solution for "Former nation, consisting of 15 republics for its last 35 years" in our The Times Specialist Crossword puzzle database.
Possible Answer for this clue is :
USSR
If there is another solution for this crossword clue - "Former nation, consisting of 15 republics for its last 35 years", let us know. Please send it to us and we will add it into our The Times Specialist Crossword database.