We know about the Tupolev Tu-4 being obviously reverse engineered by the Soviets from the B-29, and other cases early on of captured technology becoming front-line materiel, such as the AA-2 Atoll. What other aircraft did the Soviets manage to at least seek to match in role and configuration in response to their Western counterparts?

What role did Espionage play in the development of Soviet aircraft during the cold war?

Also, I heard that the Soviets were reluctant to develop "glass" cockpits so that the equipment would survive an EMP nuclear event. Is this legend or truth?

I'm sure they only look similar, but I can't help thinking they're TOO similar:

The Shuttle/ Buran -MiG-25/ F-15 -Sukhoi T-4/ XB-70 -Tu-160/ B-1 -Tu-144/ Concorde