Ri Tong-il (C), spokeman for North Korean Foreign Minister Park Ui-chun speaks with mediaduring the sidelines of the 17th ASEAN Regional Forum in Hanoi July 23, 2010.

“HANOI, Vietnam- North Korea on Friday threatened the United States and South Korea with a “physical response” to planned weekend naval exercises as tensions with the communist nation rose in the aftermath of the sinking of a South Korean warship blamed on the North.

In Vietnam for a Southeast Asian regional security forum, U.S. Secretary of State Hillary Rodham Clinton and a North Korean official traded barbs over the ship incident, the upcoming military drills and the imposition of new U.S. sanctions against the North.”

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