*False Flag incident?

While international investigators have accused North Korea of sinking a South Korean patrol corvette in March, China has taken a more cautious position.
Propeller Investigative journalist and RT contributor Wayne Madsen says it is because Beijing suspects there was greater deception at work.
“The Cheonan [navy corvette] was sunk by this torpedo that was later to be discovered to have been of German manufacture. Germany said it sells no military weapons to North Korea. This thing is starting to look like a classic false flag operation,” Wayne Madsen says.
“Kim Jong-Il who very rarely travels – and when he does, he only travels by train – went to Beijing. My sources in Beijing say that he went to Beijing, that Chinese authorities said that North Korea did this, he denied it. They were satisfied with his response,” Madsen adds. “Now the Chinese are very suspicious of the US’ intentions in richening things up in the Korean peninsula.”
Attack against South Korean ship looks like false flag operation - (May 29, 2010) 
NOTES:
(1) WHO would benefit from a false flag operation in this area? South Korea? North Korea? Russia? China?  US? Israel? Islamic terrorists?
(2) The US now gets to keep it's military base in Japan
(3) Israel purchases their submarines from Germany.
(4) Which countries were part of the international investigation? Why were Russia and China not included?
(5) Russia is conducting their own investigation of this incident.