Sleepers(1991)

Sleepers is a Cold War espionage series set during the thaw of glasnost. When the Kremlin realizes two Soviet agents sent to England in 1965 have vanished, Moscow dispatches an ambitious female operative to London to find them. She arrives to discover the missing agents have become completely assimilated into British life and desperately want to stay hidden. What unfolds is a dangerous game of cat-and-mouse involving the CIA, KGB, and MI-5, each pursuing their own agenda. As the Russian agent closes in, the lost spies must navigate conflicting loyalties and the threat of exposure, caught between the world they've built and the state that sent them.