But that's the problem. Since the beginning of the war,the Russian Air Force has taken a beating. And these weapons systems are the best for taking down Russian fighter jets and bombers,that lack the sophisticated equipment and technology of Western aircraft. Russians have been left behind in a lot of things. They concentrated on ERA,ATGMs (that are not fire and forget neither top-down attack),missiles and producing dozens of different models of MRAPs from which they've only mass produced a few.
The PAK-FA had problems,the Armata production was delayed,the BMP-T was ridiculously delayed to be used in active combat even in Syria,the S-400s are a myth and the fact is that Russians still lack a lot of digital and laser-guided equipment.
Also,when it comes to ground operations to consficate precious defense systems...they're not on the front line. They're way back. And so far,the exact opposite has been happening in the war. Russians abandoning AA systems and Ukrainians ending up capturing them.
In the end,after 2008 and the war in Syria,I thought Russia had returned to quality. But I guess it was just not true. Corruption and incompetence still exist in the Russian leadership and army. Unfortunately. And they won't even take criticism from their own men. They just sack whoever has a different opinion about strategy and tactics.