Meanwhile, North Korea has once again lashed out at the United States saying the recent visit to South Korea by a top U.S. official and the deployment of B-52 bombers in the two countries' military drills was a grave provocation and could spark a nuclear war.
Referring to U.S. Deputy Secretary of Defense Ashton Carter's meeting with this South Korean counterpart this week, the North Korean agency that deals with inter-Korean relations accused Seoul and Washington of devising military plots against Pyongyang.
It added the U.S. B-52 strategic bombers and nuclear submarines are within the North's target range.
Meanwhile, Pyongyang's state media reports North Korean leader Kim Jong-un ordered anti-aircraft rocket and unmanned combat air vehicle exercises on Wednesday but did not provide specifics.
North Korea has threatened to take military actions against South Korea and the U.S. over Washington's decision to deploy B-52 bombers over the Korean peninsula.

Reporter : hyunbin@arirang.co.kr