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Ask the South Korean general in charge of the investigation of the sinking of the navy corvette Cheonan in March how to stop a North Korean submarine from staging torpedo attacks, and he's got a simple response.

"Defensive measures are very difficult and limited," said Lieutenant General Park Jing-e in response to Asia Times Online's question at the show-and-tell on Thursday put on by South Korea's Defense Ministry on the episode in the West or Yellow Sea in which 46 sailors lost their lives. "The most effective way to destroy the submarine is to destroy it when...