

Right now nearly all aid to Ukraine comes from Europe and Russia is not able to win that war. At least not easily. That is with Russia in a war economy, whereas Europe half asses deliveries for the most part and obviously there are over a million professional European soldiers with some really good kit around as well.
Russia could not even prevent Assad from falling to some militia with some training from Turkey, while Iran was also helping. What do you believe is going to happen, if they would try to fight another professional military? They are not even winning in Ukraine, which gets some support from Europe, while Russia has a full on war economy.