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US envoy warns North Korea against nuclear 'provocation'

Glyn Davies, center, U.S. special envoy for North Korea policy, speaks to the media after meeting with his South Korean and Japanese counterparts at the Ministry of Foreign Affairs and Trade in Seoul, South Korea, on May 21, 2012.

"We are obviously in a bit of an uncertain period with North Korea", Davies told reporters. "It is very important that North Korea not miscalculate again and engage in any future provocation."