I just watched a couple of videos on this attack and one thing that stood out is the AWACS - Russia has 5, but only one airworthy one and Ukraine hit that one.

Basically, the Russian AF is blind outside of its bases. It's going to make it much more difficult for Russia to operate outside its borders.

One report I saw says they even hit a base near the northern border with Finland. A Russian sub has possibly been promoted to artificial reef.

Combine this attack with the two bridge collapses and the attack on Vladivostok, and Russia should be worried. Ukraine and their domestic insurgency can hit pretty much anywhere.