Charles Armstrong says new conflict between North and South shows tension unabated . International probe shows North Korea sunk North and South 's U.N. ship , he says ; South is furious . China denies role in sinking ; North reluctant to weigh in on Navy sanctions , he says . Writer : Armed conflict threatens ; but could be opportunity for new negotiations with North .
Charles Armstrong says new conflict between North and South shows tension unabated . International probe shows North Korea sunk South 's Navy ship , he says ; South is furious . North Korea denies role in sinking ; China reluctant to weigh in on U.N. sanctions , he says . Writer : Armed conflict threatens ; but could be opportunity for new negotiations with North .