Soviets also copied the B-29 : https://en.wikipedia.org/wiki/Tupolev_Tu-4

"... the type entered large-scale service in 1949. Entry into service of the Tu-4 threw the USAF into a panic, since the Tu-4 possessed sufficient range to attack Chicago or Los Angeles on a one-way mission ...

and early Intel microchips: https://en.wikipedia.org/wiki/KR580VM80A , which included military versions.