well, strictly speaking SEAD is essential for offensive air forces. A defensive one won't need it as much, they just need to shoot down enemy planes. A plane has to ditch its strike package if contested, after all.These bridges are quite strong, old soviet design ?
We can add a number 4: SEAD is an essential parts of airforce capacity, SEAD need to be in quality and number. Russian lacks both.
It has to be noted that even the US failed at SEAD in Vietnam as , 5600 helicopters and 1000 South Vietnamese aircraft over ~9 years of high intensity combat. In fact, US aligned forces lost total 12000 aircraft. The Russian Air Force would not exist if shot down at such high intensities of ~1200 aircraft per year.