Calling Putin's bluff on invading Ukraine was the biggest mistake the West made. NATO should have seeked to recruit new member countries from other regions. They forced Putin into action.
If you are calling for an assault on Russia in the hopes of making Putin bow out of this war, you would be effectively starting WWIII. Putin has just recently called bluff on readying the nuclear warheads, I don't think any leader wants to antagonize the situation any further.
The most reasonable course of action IMO (with the least amount of casualties) is to let Putin have his way for now, and let him deal with the consequences later on.