North Korea has promised a "physical response" to joint US-South Korean military exercises this weekend.
The comments came as Asian foreign ministers met in Vietnam for a regional security forum.
The forum has been dominated by the crisis resulting from North Korea's alleged sinking of a South Korean warship in March.
The US has accused Pyongyang of "provocative" behaviour and on Wednesday announced new sanctions.
North Korea's delegation spokesman at the Association of South East Asian Nations (Asean) Regional Forum (ARF) in Hanoi said the military exercises - which begin on Sunday - were an example of 19th century "gunboat diplomacy"...
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