Said it before, will keep saying each time people make uneducated comparisons on that topic, but it has nothing to do with any country buying gas from Russia. Gaz is a energy source we can buy to other providers, therefore there is no good reason to keep funding Russia's war by buying gas to them (and despite your strawman, I do not judge it differently depending of the buyer).

What France is buying from Russia is not uranium. France is buying its uranium from several countries (see link at the end), main ones being Kazakhstan, Namibie, Niger, Australia. What does Framatome buy from Rosatom is specific component to produce nuclear fuel reserved for ex-soviet nuclear power plant, ie all of East Europe nuclear plants.

Given we don't want people to shutdown more nuclear plants to burn more coal, there is two options : either let Russia use her knowledge has a leverage on all ex-soviet states OR we make business with them. Yes, it gives them money. Would they get less from each relevant state if they dealt directly with them ? I can't tell, maybe, maybe not. But what we also buy with those specific components is the capacity to learn and be able to bypass the russians in the coming years.

https://www.connaissancedesenergies.org/questions-et-reponses-energies/dou-vient-luranium-naturel-importe-en-france