South Korea came closer on Thursday to blaming North Korea for the sinking of a navy ship in March that killed 46 sailors with reports saying it plans economic measures to punish Pyongyang for a suspected torpedo attack.South Korea has not officially accused the North of sinking its navy ship but has made little secret of its belief Pyongyang deliberately torpedoed the 1,200 corvette Cheonan near their disputed border in retaliation for a naval clash last year. "The sinking of the Cheonan showed the cold hard realities of division (on the peninsula) for the world to see," South Korea's pointman...