My greatest concern is what comes next. The current regime is a kleptocracy, which is awful for the people, but easy to predict and control and siphon cheap natural resources from. They stay in power partly by fear of EU/NATO, but it’s questionable support. Once the kleptocracy is gone, EU/NATO can either embrace Russia or maintain the current stance against them. Embracing Russia will diminish EU/NATO power and purpose. Maintaining the current stance will strengthen the alliance against them, while pushing the country toward extreme nationalism in a new regime with nothing to lose and a lot to prove. There will not be a clear decision point to switch course; it will either be gradual de-escalation on both sides, or gradual strengthening.
On the other hand, Afganistan yielded to Taliban right away as the US forces retreated. So clearly your mileage may vary with interventions!
If Russia isn't invading any NATO country then there's no opposition.