Pre-2008 Russia has been repeatedly making mistakes. Open sources saying they don't even have a missile platform to use in their SSBNs. They should choose Mig's instead of Su's research on that one. Since I am not an expert, so I am extremely bold and dare to say anything.
-> It's difficult to optimize Su-platforms; Migs are wild cards, If Migs are optimized, last night a gypsy told me
there is a great chance Migs based 5th gen can take on the best breed of American crafts. For the next 5-10 years, American fighter jets will likely remain ranked #1 in the world, however not necesssarily dominant of skies,
since a small squadron can be probably challenged by best breed of today's Su-s with advanced missile and radar systems.
While the best bet China has is to increase their radar and missile capabilities.
These are all my EDUCATED WILD GUESS, obviously.