Ukraine

The French want to expand the programme precisely because it is expensive: Under French doctrine you don't really need more nukes to defend the continent vs. the country, but the costs can be shared.

Also there's no way to get Germany to stop buying F35s without switching Germany's nuclear sharing over from the US to France: Eurofighters aren't certified for US nukes due to industrial espionage concerns. France wants to extend their doctrine of strategic autonomy to the whole of Europe, again, costs, which is why they regularly get pissy when other member states buy US equipment.