Trade in War

I for example do not understand how it can be possible that Ukraine transports Russian gas on its pipeline network. Not sure if that's still the case though.

Nor do I understand how Europe still buys gas from Russia.. in effect funding and prolonging the war. They seem to be playing both sides. Saying how horrible the Russian regime is, while directly giving it more money. And then giving weapons to Ukraine..

It seems completely morally bankrupt... If instead of Russia it was ISIS, would they still send money just so they have cheap gas? Like at what point would they stop? Do the Russians need to be impaling babies and goosestepping through Red Square?

I also don't understand why Ukrainians don't feel a deep sense of betrayal about this