Some Countries don’t have Uranium and have to buy it from Countries like Russia

It's actually the urainium processing that is outsourced to Russia. The nuclear fuel processing is complicated and basically only makes sense to have if you need it for nuclear weapons production.

But another issue is that urainium mining is quite damaging to the environment, so countries like France like to outsource it to former colonies like Niger, which tells a lot of about power dynamics at play. Germany for example has sufficient uranium deposits that were mined in the past, but they abandoned that long before shutting down their reactors.