North Korean leader Kim Jong Un has said South Korea's plan to build nuclear-powered submarines will "worsen the instability" in the region, calling South Korea's move a threat to the North's national security, according to state media on December 25.
North Korean leader Kim Jong Un made the remarks during an on-site inspection of an 8,700-ton nuclear-powered strategic guided missile submarine under construction, the Korean Central News Agency (KCNA) said.