Russia SAM's are good. It's the only thing where they (can) put money. Aircraft designs are solid but they don't have "gadgets" to equip them and be competent at modern air combat.
SAMs can be good only by the dissuasive factor. Which is the point of them.
Although not sure how many operative new SAMs Russia has or can move to the front in operative state. The USSR had great technology and even sometimes was better than US tech, but they lack the means to create a reliable industry production of it. So most of the stuff stays as a few demo products but never gets to the front in full scale.
When the F16s arrive, Russia's own air defense will vanish in smoke & fire.
Doubtful. I would love for this to be the case, but a supply of F-16s will just strip Russia of its current dominance over contested airspace. There's a reason SEAD motto is "You gotta be shittin' me"
