https://www.rferl.org/a/for-your-spies-only-a-brief-history-of-cold-war-prisoner-swaps/29691372.html
For Your Spies Only: Cold War Prisoner Swaps
The detention of an American in Russia on espionage charges is making some wonder if the ground is being laid for a classic East-West spy swap.
for your spies onlycold warprisonerswaps