The United States and South Korea began on Monday what the South Korean military bills as their "largest-ever" air exercise, in the wake of North Korea's test-launch last week of what it claims was a new type of intercontinental ballistic missile.The five-day annual Vigilant Ace exercise, involving more than 230 warplanes from the two sides, aims to demonstrate the allies' combined air power against North Korea.Six U.S. F-22 Raptor stealth fighter jets landed at an air base in the southeastern city of Gwangju last Saturday, with F-35B stealth fighters deployed in Japan and B-1B bombers stat…READ FULL ARTICLE