North Korea appears to be preparing to test a new ballistic missile submarine capable of launching nuclear missiles, significantly bolstering the regime’s ability to conduct long-distance attacks. Satellite photographs taken Monday of the Sinpo South Shipyard in North Korea show the new submarine with nearby cranes and support craft, suggesting the submarine may be in preparation for a launch test. Last month, North Korea claimed that Kim Jong Un had inspected a “newly built submarine” at the shipyard. The new photographs appear to confirm the claim, say Joseph Bermudez and Victor Cha of Beyond Parallel, a research project backed by...