Not quite. Dutchie has a point which may be unfashionable around here but that doesn't make it any less valid.
Also - before getting accused as a warmonger, let's not conflate what needs to be done with what we are willing to do.
The west and I suspect most here underestimate how ingrained Russian Military might is into the psyche of the Russian people.
You can't travel far in Russia without glorious memorials, military propaganda, military personnel, military parades, patriotic songs. Russian TV is almost an endless procession of Russian War Movies and the News is an endless procession of military exploits and patriotic stories. We laugh at Putin's strongman image, but it's an integral part of what the majority of Russians want; a strong leader to protect them and the means to protect the motherland from all-comers. Of course the west is usually the bogey-man in all this. One UK Destroyer entering the Black Sea is projected as an invasion.
Russians are tough hardy proud people. Many live in conditions that we would find hard to endure. These are the people of Stalingrad and the 900 days....
So, taking that on-board, there is not a cat in hell's chance that Putin will withdraw troops. He will lie to his people about their performance, he will silence dissenters and he will control the narrative, but he will not under any circumstances retreat. He will however (and his playbook is well documented on this), ramp up the atrocities and find excuses for domestic consumption to do this. But he will wage war. Anything less than victory by ANY means is untenable. Putin and his regime do not care about dead babies or sanctions. People starving on his streets, will be spun to give more power to his elbow to defeat the fascists.
Hoping that Ukraine unaided can drive them from their lands is a great hope, they will face endless atrocities with chemical and possibly bio-weapons... I don't think they can do this alone.
There will not be any kind of peoples revolution that will depose him in any suitable timescale.
He may face a coup within the Kremlin, but only if he shows weakness, and those that depose him are probably just as insane.
BUT, the west cannot afford to let Putin win.
And it's a moot point, but we're already at war, WW3 is underway, any other description is dancing on a pin.. We might not have fired a bullet, but, training, arming and supporting Ukraine with weapons, economic warfare, and no doubt cyber-warfare against Russia is still war. Hand-wringing about sending Polish Migs to Ukraine is no different than supplying anti-tank missiles.
Putin's Russia has to be defeated militarily and the regime changed...that's not going to be done by Ukraine alone.