### Comment:
S-400 interacting with the F-35 is baaaaad. Allows controlled tests of the radar/targeting in relation to the F-35. Basically it gives data to Russia to develop best practice tactics vs the F-35. You generally want your advance stealth fighter to be as much of an unknown as possible

### REPLY:
Nevermind Israelis and US Airforce flying in S400 zones already...Clearly the problem is Turks

### END.