The no brain solution is to electrify everything and switch legacy infrastructure to renewables, just like China does. Gas usage is down in the EU anyway.

No brain because there is lack of survival instincts in such phrase?

Russia openly declares willingness to destroy europe, your lifestyle, way of thinking etc. They claim they are better. Sure , sponsoring this country is no brainer lol.

Germany already financed biggest war in europe since WWII by flooding russia with oil money. Is that not enough?

Amount of money EU spent to tame the fire of war could easily cover building 20-30 nuclear plants across the europe to solve the heat/cooling problem once and forever.

no brain in the truest sense of it.