North Korea vowed Wednesday that it "will take every necessary measure to protect its sovereignty" in the midst of 12-day U.S.-South Korea joint military exercises. “These war exercises were kicked off by the U.S. and the South Korean puppet war-like forces across South Korea at a time when the inter-Korean relations have reached the worst phase and the situation has grown so tense that a war may break out (at) any moment due to the reckless policy of confrontation pursued by the South Korean conservative authorities,” North Korea’s official KCNA news agency said