CANBERRA, Australia -- North Korea's ambassador to Australia warned Sunday that international attempts to halt his nation's missile tests could lead to war. In a letter to The Sunday Herald Sun newspaper in the southern city of Melbourne, Ambassador Chon Jae Hong defended last week's missile launches as "routine military exercises" aimed at increasing the nation's "capacity for self-defense." He said North Korean's missile program and tests were key to keeping the balance of force in northeast Asia. "It is a lesson taught by history and a stark reality of international relations, proven by the Iraqi crisis, that the upsetting...