Sukhoi: a comment and a question:
The comment is that Russian aircraft usually look odd. I have always believed a plane that looks good will fly good. Soviet aircraft usually look like something out of a 1940’s Flash Gordon comic book, BUT the Su-27 is a beautiful exception. (Opinion, obviously)
The question is “Why did Tolkachev do it?” Surely, it wasn’t simply for the money.
Oldplayer
From the article above.
Motivated by the persecution of his wifes parents under Joseph Stalin and disappointed in the communist government, Tolkachev established ties to the U.S. Central Intelligence Agency in Moscow and, beginning in 1979, began transferring huge volumes of highly classified and extremely sensitive data about the most important avionics, radars and weapons installed in Soviet-made combat aircraft.