Quote Originally Posted by firefinga View Post
Not surprisingly. Putin is using Syria as a testing ground for weaponry. The Russian stealth fighter Sukhoi - SU 57, although officially still in its prototype phase, was being used in the area of Eastern Ghouta in February and March.

https://en.wikipedia.org/wiki/Sukhoi_Su-57
usa is doing the same: http://www.businessinsider.de/us-syr...18-4?r=US&IR=T