North Korea Unveils New Tactical Nuclear Attack Submarine

North Korea has launched a new "Korean-style tactical nuclear attack submarine" named "Hero Kim Kun Ok," which will serve as a core offensive weapon for the country's naval force, according to state-run media. The announcement comes after North Korea simulated a nuclear missile attack in response to joint military exercises conducted by the United States and South Korea. North Korea has been increasing its missile tests this year and is set to celebrate its 75th anniversary on September 9.