North Korea’s move to publicly reveal the full hull and displacement of its first nuclear-powered submarine under construction appears to be a strategic counter to bids by the US and South Korea to expand their undersea capabilities. North Korea’s state media on Thursday released images of leader Kim Jong-un inspecting a “nuclear-powered strategic guided missile submarine” being built at an undisclosed location. Kim was accompanied by his wife Ri Sol-ju and daughter Kim Ju-ae, believed to be...