US, South Korea begin largest-ever joint air drill

The US and South Korea on Monday kicked off their largest ever joint air exercise, an operation North Korea has labeled an 'all-out provocation,' days after Pyongyang fired its most powerful intercontinental ballistic missile.

The five-day Vigilant Ace drill—involving 230 aircraft, including F-22 Raptor stealth jet fighters, and tens of thousands of troops—began Monday morning, Seoul's air force said.