France imports solar electricity from Germany during the day because Germany installed too much solar without the necessary storage capacity. This power is often sold at a negative price because it's not needed but must go somewhere. Germany imports nuclear electricity from France and coal electricity from Czechia and Poland at night because it doesn't have enough baseload capacity.

Nuclear fuel is so energy dense that it doesn't really matter where it comes from. You only use a teaspoon per person per year.

That said, Uranium is a commodity and the biggest producers are Kazachstan, Canada and Australia.

France subsidizing their colonies to maintain influence is a typical French thing. They also buy sugar from their old colonies at inflated prices.