In my opinion this Ukrainian corvette is more comparable wit Russian 20385 corvette than with standard Steregushy corvette. 20385 have 2×8 Redut VLS ans 8 cells UKSK launcher for Onix or Club missiles.

Vityaz is not S-300V4. It seems a lot of people don’t know, that Russia have two different air defenses. One is territorial (VKO an air force air defense) and the second is ground forces air defense to protect army units. VKO (air force) air defense have S-300P series, S-400, Pantsir-S1 and in near future also S-500, Vityaz and Morphei. Ground forces have S-300V series, Buk-M1/M2, Tor-M1/M2, Tunguska, Strela-10.

S-300V4 is for ground forces air defense and S-400 is for VKO. There are no problems with S-400.

Mock ups are fine for crew training and for carrier equipment testing. It seems Varyag is ready to receive real aircraft. I wonder if J-15 pilots also practice carrier take offs and landings on carrier mock up.

It seems you do not know, that air defense always work in cluster, where long range, medium range, SHORADs, MANPADs and AA guns work together networked and cover each other, that weak points could not be exposed. S-400 will never work alone and is not dependent only on its own tracking radar. S-400 could get enough small target cell from other radars or passive systems to launch ARH missiles against targets on quite a long distance and without need to turn on its own radars.

So you think Russian S-400 is not integrated in network? You must be joking.:D

S-400 use different missiles including 9M96 which are very capable against fighter size targets in longer distance than 20 km, what is also range of Pantsir-S1. Just a presence of S-400 will make fighter planes to fly low and than they will be easy targets for SHORADs, MANPADs and AA guns.

The NATO has special training areas and exercises to deal with all kind of AD-systems.
http://www.xisquadronassociation.co.uk/news/news_ef3.html (to give an idea about that)
It is from the present ones including unkown developments. ( Such exercises were run in simulators at first and verified by real missions afterwards. In need for a real SA of pilots/crews over a country-side, which is the most difficult part to simulate as well as the people and their real-time behavior at the AD-sites.) The present NATO is in the lucky position to have surplus numbers to deal with every possible threat under worst case situations. It is just worth to make up some mind about the related exchange ratio to win the local air-superiority.
The number of high-tech Russian systems f.e. is limited and will be so for some years to come.

Considering that EU states are almost bankrupt now and they will sell most of their weapons to get some $$$, this balance will be soon on Russian side.

I think Nebo-M will be early warning radar complex same as Gamma-D, Gamma-S, Protivnik, Nebo-SVU, etc radars. Actually Nebo-M is developed from Gamma-S, Protivnik and Nebo-SVU radars and all three in Nebo-M are AESA radars. Gamma-D and Nebo-SVU are also AESA designs, while other are PESA designs.

S-400 use 91N6 in regimental and 96L6 in battery level search radars.