Kim Jong Un Inspects New Nuclear Submarine and Oversees Missile Test

Pyongyang’s recent displays are partly a response to the arrival of the US nuclear-powered submarine USS Greeneville at the South Korean port of Busan earlier in the week. State media described the US submarine’s presence as "nuclear muscle-flexing" and a dangerous attempt at confrontation. North Korea frequently uses its own missile tests and factory inspections to signal that it will not be intimidated by the presence of high-end US strategic assets in the region.