Do the Russians remember the "Tupolev Tu-4"? A line-for-line, rivet by rivet copy of our interned B-29s by our supposed "allies". That was certainly their own design, wasn't it?
What goes around, comes around, baby.
The Soviets made an exact copy of our Titan II ICBM. Intel verified they actually used copies of our Air Force Technical Orders and SAC-Civil Engineering Manuals to run their system.