Clinton Warns North Korea And How Did North Korean Subs Responds?

Well here is another worry.

http://www.todayonline.com/World/EDC100527-0000104/N-Korean-subs-go-Awol

• N Korean subs go Awol
  05:55 AM May 27, 2010
  SEOUL - United States Secretary of State Hillary Clinton warned North Korea yesterday halt its "provocations and policy of threats" and said the world must respond to its sinking of a South Korean warship.
  
  Mrs Clinton, who was visiting Seoul to show solidarity amid rising inter-Korean tensions, also said the US was reviewing additional options to hold the North accountable.
  
  North Korea threatened yesterday to shut a border crossing and open fire on loudspeakers if South Korea makes good on its vow to blare out propaganda across the tense frontier.
  
  Military tensions are high after the South last week accused the North of sinking a warship in a submarine torpedo attack in March.
  
  The South on Monday announced a package of reprisals, including a halt to most trade with its neighbour. It is also mounting a diplomatic drive to punish the North through the United Nations Security Council, although veto-wielding member China is reluctant to sign up.
  
  The North, which denies involvement, announced late on Tuesday that it was cutting all ties with the South.
  
  Meanwhile, South Korea's military is trying to track four North Korean submarines which disappeared from radar screens after leaving a base this week, officials said yesterday.
  
  Yonhap news agency quoted an unidentified military official saying "it's quite rare that a multiple number of North Korean submarines have left no traces for two straight days. We're trying to find them by using all naval capabilities in the Sea of Japan". North Korea reportedly operates 40 Sang-O class submarines.
  
  The US on Tuesday announced a plan to carry out an anti-submarine exercise in the Yellow Sea soon, jointly with the South Korean navy. AFP

Multiple number os submarines have disappeared.

Irony. U.S. Intelligence Sees Scant Evidence That North Korea Is Preparing for War

• Despite all the recent huffing and puffing from Pyongyang, U.S. officials say they've seen little physical evidence that North Korea might actually be preparing to go to war. Just hours after Seoul blamed the North for the March 26 sinking of the South Korean naval vessel Cheonan, North Korean leader Kim Jong-il publicly ordered his armed forces to get ready for military action, according to sources quoted in The Guardian. But two U.S. national-security officials, asking for anonymity when discussing sensitive information, tell Declassified they're not aware of any intelligence reporting on significant military mobilization or redeployments inside North Korea. The North Korean military is always on the move somewhere, one of the officials said, but at the moment whatever movements are being noted by Western intelligence agencies are regarded as not particularly threatening. A third U.S. foreign-policy official, who also asked for anonymity, told Declassified that U.S. agencies are picking up "nothing of extreme concern" in what North Korean forces are currently up to.

Could these US Intelligence explains why the four subs went dark?

What if war starts between these two Koreans countries?

How?