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In 2000, 25 years after the end of the Vietnam War, North Korea and Vietnam admitted for the first time that North Korea had provided military support in combat against United States aircraft.
North Vietnam sought North Korean pilots’ help in training and combat apparently to take advantage of their experience in shooting down US fighter jets during the 1950-53 Korean War.
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http://www.bernama.com.my/bernama/v5/newsindex.php?id=631827As if we didn't already know!