But they do have plans and they will.
Be careful of believing that America hasn't planned this escalation of an attack on Russia.
The missile system is exactly for that purpose but the purpose won't be played out immediately.
And the longer range ammunition will be supplied to the Ukraine in due course, so that the excalation can be pinned on Russia.
The only question remaining is on how Russia will escalate to counter those missiles.
So even though Russia may secure it's intended objective, the war can't end. Russia will turn to defending it's territorial gains while America turns to the offensive on the guise of their Ukraine proxy carrying out the fight.
Will the fight end when the last Ukrainian is dead?
No, of course not. The intent has nothing to do with Ukraine's territory returning to Russian hands.