Absolutely - but not more sorry I assume than for the innocent Germans who suffered under Hitler's actions. Not every country gets light off for enslaving other countries and killing millions like most of the European colonial forces did over centuries.
I didn't say either that this would be my preferred line of actions ... but it is clearly better than appease the monster and feed him every year a bit more of our freedoms and lives.
Sometimes an end with horror is better than an agony without end. But given that you seem to be such a political and military genius ... what solutions do you propose? Maybe we should already start to evacuate Poland and the Baltikum to make sure Putin's poor and innocent soldiers are not inconvenienced with fighting on their way towards the West. Maybe we should provide as well rations and tank stops for his troops given that they apparently forgot to look after the logistics. Anything it takes to not annoy Putin with the big button ...
Just tell us - how far you are willing to bend over for him? ... and what do you propose to do if Putin reaches the limits you are setting? Or - are there no limits for you to bend over to keep the madman happy?