I wish I was wrong though.
On Russian TV they are even talking about having Alaska back. Of course they do not have that capability, but it illustrates the imperialist mindset. Any territory previously held by Russia is desired.
Regarding the argument that Russia won't attack Europe, Russia already did. Ukraine is a EU-candidate country. Most EU countries support Ukraine's admission to the EU. The EU is already fighting a proxy war with Russia.
Regarding not having enough resources. Despite the heavy losses, Russia's army is slowly but steadily advancing, and the size of the army is larger than at the start of the invasion. There are estimates that Russia can produce 3x as many shells as the entire EU.
The amount of troops needed to occupy countries is actually smaller than people think. In 2021 Putin wrote an essay about "the national unity of Russian and Ukranian people" where he argues Ukraine is an artificial state that shouldn't exist. The war is a war of extermination, and in a war of extermination, civilians are targets as well. Russia will be de-populating cities like they did to Aleppo or Mauriopol before the occupation.
If the Russian advace continues, EU will have a difficult choice to make, whether or not to send troops to help stop the advance. I don't think Poland wants to share a border with Russia.