Hillary Clinton, U.S. secretary of state, arrives at Noi Bai International Airport in Hanoi, Vietnam, on Thursday, July 22, 2010. The U.S. said it will intensify sanctions against North Korea for sinking a South Korean warship, targeting members of Kim Jong Il's regime and the foreign banks that help sustain the country's weapon's industry. (Photographer: Nelson Ching/Bloomberg)

Photo by: Nelson Ching

Hillary Clinton, U.S. secretary of state, arrives at Noi Bai International Airport in Hanoi, Vietnam, on Thursday, July 22, 2010. The U.S. said it will intensify sanctions against North Korea for sinking a South Korean warship, targeting members of Kim Jong Il's regime and the foreign banks that help sustain the country's weapon's industry. (Photographer: Nelson Ching/Bloomberg)