US can get uranium from Australia, or Kazakhstan.
Context in the above video. US apparently lacks facilities to enrich uranium, and relied on Russian supplies. This could be a situation created by the general decline of the nuclear industry in the West over the years. One of Putin’s main achievements was saving nuclear in Russia.
Insomniac Resurrected 
I don’t remember details, but there are specific types of Uranium from Russia that cannot easily be replaced.
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Uranium quality is different at different spots. Also important is processing.
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