Realistically, Russia doesn't have the strength to take Western Ukraine, nevermind the rest of Europe.
You are confusing unwillingness for total full power blow on Ukraine with lack of might. Ukraine has the mightiest army of entire PONOS countries (Pact-of-NATO-Offensive-Sattelites) and is destroying it slowly with merely 130.000 soldiers, older generation technology with some exception in Attack Helicopters, PGMs, ATGMs and Artillery ammunition like Krasnopol. It could defeat and control of the territory with the current contigent if it would like to go the US route and blow everything to small pieces by carpet bombing and FOABing every city and would minimize it's own losses even more, but would destroy their own civilian population and create a huge problem for their own.
There are less civilian deaths than military deaths, which is unseen in any war of the past 100 years or more.
Russia certainly will not give France, Poland or Czechs this friendly treatment. It will barrage them to 19th century if they decide it is necessary and the US will not do anything besides more talking, sanctions that are only blowing back but will not dare to launch nukes, they will not die for their dogs. No owner who raises dogs and treats them badly will cry for them. That is exactly what all NATO members are, disposable war dogs! In reality majority are just chihuahuas who can only bark. Turkey is doing a very sovereign policy and are calculating who will win and they are not stupid nor affected by western MSM lobotomization. They will be the first to drop NATO membership if not Poland.
Russia could take half Europe without much of a hassle as only Poland has some logistics and forces, which they are already depleting for a country that is much stronger than Poland but still very weak.
It is a very simple calculation. Countries with no PGMs and logistics let alone a functioning army with moral against a superpower that has all the technologies there are. It won't matter if Russia kills Poland with T72B3 or T14, they have no chance nor their Leo2A4s.
Besides Poland there is no PONOS country with any mentionworthy military capability.
Russia is approaching Kiev's proxy regime the way it does, because it is a neighbouring country and like Napoleon said, Geography is destiny. You don't choose your neighbours and you certainly do not create foreign policy against your neighbours without facing the consequences. Russia has to live with all territories and people that will join by referendum after the conflict is over. It will certainly be a lot easier and less problematic, when you don't turn it to rubble like the US always does.
For the near future, if the pre-baltic chichuahuas continue their pro Nazi SS rhetoric and anti-russian politics they will just seize to exist and anyone foolish enough to believe NATO will nuke Russia or invoke Article 5 will see NATO fall apart faster than Khinzal striking the Reichstag.