U.S. F-22 fighters join S. Korea war games

Advanced U.S. F-22 stealth jet fighters were poised in South Korea for war games Monday as North Korea said its nuclear-weapons program was non-negotiable.

The U.S. military command in South Korea said it flew the single-seat, twin-engine fighter aircraft, known as the Raptor, to Osan Air Base, 40 miles south of Seoul, from Japan's Kadena Air Base near Okinawa, to showcase its most potent weaponry to North Korea.

The jets -- among the most expensive and advanced in the U.S. Air Force's arsenal -- have never been used in combat, but would likely be the first aircraft used in a conflict with North Korea, The Wall Street Journal reported.

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