I believed that in the worst case, Russia would intervene in eastern Ukraine and perhaps only expand the occupied territories to create a larger pro-Russian zone - and that this would take several days due to the military strength of the Russian army. Unfortunately, this is no longer a military conflict but an open war aimed at occupying Ukraine, and according to their leader,
some other countries will be next in line if they try to join NATO.
That's unlikely, I believe that Putin wants Ukraine to be conquered because he wants the history books to tell that Russia was the origin and not Ukraine even though Ukraine existed far longer than Russia. I hope that the economic sanctions would be enough to make them stop this war.
The EU depends on Russia, especially for gas - but will have to look for an alternative if it wants to be consistent in the sanctions against it. It is a bit hypocritical that it was announced a few days ago that the amount of gas will even be increased towards the EU, which means that the money is going in the opposite direction - on the one hand, we have sanctions, on the other hand, the EU finances Russian military machinery by buying Russian gas.
Not the whole EU, I think that some Scandinavian regions have already adopted towards green energy and slowly distancing themselves from using oil as a source of energy, I've heard of one EU country that have incentivize the ownership of an electric car although I forgot the name of that country but I am sure it's from Europe, and wouldn't some countries in EU be able to get their oil in Middle East or Africa?