N. Korea sharply increases flights of fighter jets

North Korea's air force has sharply increased jet fighter training flights in the past few days, with the number of sorties reaching as many as 700 on the day South Korea and the United States launched a joint war game earlier this week, a military source in Seoul said Wednesday.

The North's move is seen as part of efforts to beef up combat readiness and to closely monitor joint drills in the South that began on Monday.

The drill, called Key Resolve, involves about 10,000 Korean troops and 3,000 American personnel as well as military weapons and equipment, including F-22 stealth jets and B-52 bombers deployed from overseas U.S. bases.

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