The S-400 is just now being introduced, and is radically different from previous air defenses. As for Russian submarines being legacy platforms from the Soviet Union, that just shows your ignorance in the subject. The Borei class submarine is Soviet? Or the Yasen class? What about the Lada class? Still Soviet.
What has Russia made that is new? Lets see...
KA-52, yak-130, Steregushchy class corvettes, S-400, Topol M,
GAZ-2975, BTR-90, Ka-60, SU-34, Admiral Sergey Gorshkov class frigate (under construction), Gepard class frigate, R-77 RVV-SD, SU-35bm, Mig-35, Mig-29K and no they are not the same as the standard SU-27 and Mig-29, T-90, Too many Tor and S-300 variants, Baluva, ZHUK-AE, RD-33MK, 117S, Irbis-E......there is more but by now you should get the point, you should also now that there are many projects underway as well as many projects such as cruisers, submarines ect that are under construction.
The last test was a success and have you ever heard of the American THAAD? When the THAAD was in demonstration phase it failed 7 out of 11 tests and no one said a word but when the Baluva failed 7 out of 14 tests everyone and their grandmother started gossiping.
That claim has been destroyed.