The U.S. Is Paying Billions to Russia’s Nuclear Agency. Here’s Why.

In a cavernous, Pentagon-sized facility nestled in an Appalachian valley, thousands upon thousands of empty holes line the bare concrete floor.

A mere 16 of them house the spindly, 30-foot-tall centrifuges that enrich uranium, converting it into the key ingredient that fuels nuclear power plants. And for now, they are dormant.