The most convincing theory I’ve seen regarding Russia invading a Nato country is that it would be a small land grab while attempting to avoid a larger conflict. I realize this is quite lol worthy as we in year 3 of what was supposed to be a 3 day war, but there are some things which make it a real possibility.
The idea would be to blitz a city or area that most of Europe would find inconsequential, dig in similar to what russia has done in eastern Ukraine with the Surovikin Line, and then lob missiles/shaheds at anyone who helped the country regain their territory.
Putin, and really all of Russia, is convinced the “decadent west” cannot stomach war. If he was able to hold on to this area and threaten Europe (and USA if it is on Europe’s side still) then it’s possible that Nato countries refuse article 5 and the alliance is essentially over. This would leave Russia free to coerce some countries into joining them similar to Belarus, and also pick off the weaker countries one by one militarily.
I personally find it pretty likely. Russia has proven that they are capable at grabbing an area and fortifying it. I dont think a European response would be quick, and then they’d have to mobilize and attack an area that is considered worthless to most and fortified to inflict horrendous casualties.
The Ukrainian counteroffensive was a disaster. Russia used far more mines than Nato advisors predicted, there was a horrendous clip of a Ukrainian group that is trying to retrieve a comrade who stepped on a mine, and several of them end up maimed from mines while getting to him. Entire trenches were rigged to explode when Ukrainians entered them. They also had extremely effective strategies where Russia’s cannon fodder would be in the trenches, but were expected to die and lose the troop, then more experienced russian troops would counter attack with a major advantage as Ukraine had not established logistics. This use of cannon fodder is probably the most important aspect in this hypothetical scenario:
Russia has a far different approach to the value of a life. Putin does not care about the majority of his troops, or citizens. He said it is better to die in the war than drink oneself to death; that is how he feels about the average russian who signs up. They are expendable. He is more than willing to accept large losses of life, while most Europeans would not be, especially for western Europeans taking back a meaningless area of land in Eastern Europe.
The non military aspect seems even more grim. It’s easy to imagine why many people would vote for ignoring article 5 over putting their children to sleep in a bathtub for extra protection from nightly shaheds. I do not think many citizens could stomach what people in Kyiv go through regularly.
Sorry for the ramblings. What I’m getting at is that these hypothetical wars aren’t so much about if a country, or all of Nato, can outmatch Russia in a long war. It’s about Russia’s ability to manage escalation, and even a loss means that they just retreat back to current lines and say they will nuke if they realize they miscalculated and Nato does unite.
The most likely purpose of a russian invasion of a country like Poland is to grab land, hold it, and make life hell for anyone who helps. This would be done in the hope of drastically changing the geopolitical landscape of eastern Europe making it easier for russia to pick off smaller neighbors and expand.
This means the major factors would be a country’s ability to defend against a blitz (I dont think any country can at this moment), and then the ability of Europe to unite, counterattack, and deal with the losses. Considering Europe’s failures to meaningfully rearm or supply Ukraine 3 years into the conflict, this is questionable as well.