It was stolen though. https://www.discovermagazine.com/the-sciences/real-life-rogu...

> In the ‘70s and ‘80s, Russian KGB spies systematically stole NASA shuttle designs and smuggled them back to their motherland, as detailed in a 1997 NBC News investigation by journalist Robert Windrem. Later, as America tested its new cosmic vessel, Soviet aircraft and satellites flew reconnaissance missions to aide their own carbon copy.

This is settled history.