SEOUL, April 4 (Yonhap) -- Adding to weeks-long bellicose rhetoric, North Korea's military announced Thursday that it would take a series of military actions against the United States. In a statement, the General Staff of the Korean People's Army said it would "take a series of strong, actual military countermeasures as the Supreme Command solemnly declared at home and abroad." <B> It added it is formally notifying the White House and the Pentagon that "reckless operations" involving cutting-edge nuclear weapons have been finally approved.</B> China has intervened in the deepening Korea crisis by summoning the ambassadors of North and South Korea, as well as the United States, to warn tensions must be defused on the Korean peninsula. The abrupt set of exchanges came after Pyongyang shut down the last shared link with the South by refusing entry to almost 500 South Korean workers who work in a cross-border industrial park. Zhang Yesui, the deputy foreign minister, outlined Beijing's "serious concern about the present situation", and added that it expects the escalation of tension to cease. "All sides must remain calm and exercise restraint and not take actions which are mutually provocative and must certainly not take actions which will worsen the situation," said the foreign ministry. http://english.yonhapnews.co.kr/news/2013/04/04/0200000000AEN20130404000200315.HTML http://www.telegraph.co.uk/news/wor...ust-be-defused-in-deepening-Korea-crisis.html "reckless" operations.