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Some experts say that’s an overreaction.

“They can carry at most a hand grenade,” said Lee Hee Woo, a retired air force general who heads the Integrated Logistic Support Research Center at Chungnam National University in South Korea. “A small aircraft won’t be easily detected by radar, but they can’t carry much so they can only be used for surveillance purposes. A bigger size of aircraft is needed to carry weapons, but that would be detected by radar.”

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Associated Press writer Eric Talmadge in Tokyo contributed to this report.