Interesting. My understanding is that the US refused to deliver after Turkey bought S-400 systems from Russia, and will still sell the F-35 to Turkey if they stop. Do the systems share radar returns with mother Russia or what exactly is the concern?
Bingo. These systems are not packaged goods, but come with services that depend on getting a lot of the data to improve the system, and it's hard to control how they share. An air defense system is part of a network.
