This is interesting

This here Ruski feller thinks they hi-jacked an F-111 and copied it during the Vietnam war. The article is a bit confusing. I think there was a question over what kind of plane it was. The author seems to think that the SU-27 was based on technology from the stolen F-111. Interesting. I'm looking forward to reading the next three parts of the story.

Now, I know about the B-29s they impounded and reverse engineered during WWII, but I've never heard any hint of something like this.