Russia is gearing up to test the first prototypes of its next-generation Almaz Antey S-500 air and missile defense system. The S-500 Prometey—also known as the 55R6M Triumfator-M—is expected to be much more capable than the current S-400 Triumf.
http://nationalinterest.org/blog/the-buzz/no-fly-zone-russias-next-gen-s-500-start-tests-year-15085