funnily,There is a concern, there should always be one. But concerns don’t mean absolutes. S400 is an impressive system but has been hyped as doing everything from killing stealths to making julian fries.
The main worry is that because hypothetically Turkish F35 would be operating next to S400 and sharing data the S400 would be getting clean scans of F35 on a regular basis and would need data access to Data link and other signals to prevent Blue on Blue. All of which would weaken the ability of F35 to be used against S400 if needed.
It would give Russia access to signals and signature as they would be part of the S400 maintenance system.
#594 Brumby, Yesterday at 9:45 PM
spun the other way (suggesting "the F-35 vacuum up every emission from" the S-400)
anyway, stealth-is-a-must-against-S-400 stealth-is-a-must-against-S-400 stealth-is-a-must-against-S-400 PR campaign has worked sort of too well