1) Russia will militarily collapse, or 2) Ukraine will collapse & Russia will continue to be aggressive against its neighbors. A partition of Ukraine is a temporary reprieve of 2) as Russia will see it as a win for their greater Empire & rightful place & move forward as they see opportunity.
Now you answer your own question.
Is it fair to say that the US military + other western allies have also been consistently aggressive against other nations?
What example would you point to showing Russian military aggression against their neighbors in the last 20 years?
PS edit to note your reference to potential national liquidation/collapse is interesting ...i hadn't considered that