Given the attack is irrelevant to the war at this point, Russia has shown restraint in retaliating. I wouldn't bet on that being the case if it happens again.
My opinion is that Russia has played this well - launching a slow-paced war that made it hard for NATO to get involved, other than money and weapons and training.
Had they gone in with everything they had it would have looked much more dramatic...
And Russia has now secured at least +80% of Ukraine's energy and mineral wealth, meaning to manufacture anything in Ukraine will require importing the raw materials and energy to do it.
Further, my speculation is that the seacoast it the next objective.
Putin having a bad cancer and war weekend in Sochi.