I don't think the "EU" buys fuel. It's individual countries. The promise by the EU to buy LNG was empty. What country is going to buy it?
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Russia might not have made the decision to invade Ukraine if Germany hadn't tied its energy needs so transparently to Russian natural gas.
And absent blowing up Nord Stream, might have hung Ukraine out to dry anyway.
So having to rapidly build LNG import terminals? Repaying that debt.
Regarding nuclear, the electricity companies didn't want to continue after they had already prepared to shut down the reactors. Maintenance was deferred, people let go or reassigned, etc.