A Hong Kong-flagged cargo vessel that recently made a port call in Japan may have breached a ban imposed by Tokyo on the entry of third-country ships that had earlier visited North Korea, investigative sources said Thursday.According to the sources, a crew member from the vessel "Ocean Skipper" told Japanese police that the ship called at the North Korean port of Rajin in January and February, loaded tens of thousands of tons of coal each time and shipped them to China.If the statement is true, the vessel violated Japan's unilateral sanctions against Pyongyang, which, among other things, pr…READ FULL ARTICLE