Kim's tour of this facility offers a rare glimpse inside this part of North Korea's nuclear program. North Korea routinely cites the US as the motivation for its illicit missile and nuclear weapons programs. North Korea's nuclear program is a major concern for South Korea. It's unclear exactly what Russia is offering in return, but North Korea could receive food, fuel, and possibly even advanced military technologies. Earlier this year, a top Korea watcher said that North Korea has likely found itself "sitting pretty" amid its new partnership with Russia and connections with China.

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