Or maybe not. Here's more evidence of a false flag operation. And the motive would be Japan's desire to get the US bases off Okinawa, and the US' intention to keep them there...

http://mostlywater.org/north_korean_ship_sinking_another_false_flag


This page has a link to a pdf of a letter sent to Hilary Clinton by one of the investigators...

http://letsrollforums.com/korean-ship-sinking-definitly-t21375.html?t=21375


The government of North Korea doesn't have anything to gain from an attack on the ship. The government of the US does. The government of North Korea, and the government of China both say that North Korea didn't do it. The government of China has been investigating also, and they say the US sunk the ship. Looks to me like a false flag operation designed to pressure the government of Japan into allowing the US to keep its bases in Japan.