No it hasn't, to be fair. It hasn't in this conflict. There is only escalation. Also that doctorine has changed in this conflict to certain extents and reasons.

These new territories are now a part of Russian soil. Except there is a conflict. It hasn't suddenly decreased because Russia has gained a larger protectorate, shouting ohhh it has the nukes. Wait what. Ukraine wants its land back, and is still fighting for it. It has technically escalated. Ukraine might fight even harder for it. It will seek even more arms to get it.

So dumbass this conflict will escalate. As it does the probability of nukes increases.

Not whether or not, Russia remains in conflict, it is and it hasn't stopped. It has escalated. Russia has mobilised. Not what capability Russia has. It was obvious Russia has nukes, and has acquired parts of the former Ukraine. It wasn't that concern. I don't care much. Not Ukrainian. Not Russian. Except I question the larger odds of nukes. They remain probable.