The reliance on Russian nuclear fuel services is a consequence of decisions made decades earlier in U.S. made during Bush era and later Obama era.
"Following proposals from the International Atomic Energy Agency (IAEA) and Russia, and in connection with the US-led Global Nuclear Energy Partnership (GNEP), there have been moves to establish international uranium enrichment centres."
"The first of these international centres is the International Uranium Enrichment Centre (IUEC) established in 2007 by Rosatom at Angarsk in Siberia"
https://world-nuclear.org/information-library/nuclear-fuel-c...