US Ally Launches Missile Submarine Amid North Korea Threat

South Korea has launched a missile submarine amid North Korea's nuclear advances and reports that it received support from Russia in developing underwater warfare.

Newsweek has contacted the North Korean Embassy in Beijing for comment via email.

Why It Matters

During a military parade earlier this month, North Korea showcased a nuclear-armed missile capable of striking the U.S. and strategic cruise missiles covering the Korean Peninsula . Recent South Korean intelligence also indicated that Russia, a strategic partner of the North, supplied a nuclear reactor for the country's submarine program.

Facing North Korea's continuing development of nuclear and missile programs, South Korea , a United States mutual defense treaty ally , has developed a military strategy known a