The Russian Army is a conscription Army. When I was there last, they had reduced the mandatory service from 24-18 months. Obviously they were young troops, and unlike our Army, all direction comes from Officers, not NCO's. What they have to their advantage is numbers and resources.
It's a tough situation for them to be in. There are familial ties, shared language, values and lifestyles between them and the Ukrainians. How much "heart" they put into the fight is hard to gauge, but one can speculate.
I think Putin is following his playbook, and his moves are predictable. What the world doesn't need is for over-reaction on our (everyone except Russia) parts. Keep up the sanctions and materiel support. Putting BUFF's over the Arctic would only inflate the situation internationally.
For consideration though is the amount of Russian troops committed to action, vs those in reserve on the borders. This may be just the scouting missions, to test the Ukraine resolve, and to deplete their resources.