Adding to weeks of regional and international tensions about airspace over parts of Asia, the South Korean government Sunday announced plans for a newly expanded air defence zone.<br/> <br />Government officials said the new zone would include airspace over an underwater rock that houses a South Korean research station.<br/> <br />The move came after China's announcement last month of their own air defence zone which includes the submerged rock plus the airspace over a group of islands at the heart of a major territorial dispute with Japan.<br/> <br />Under China's air zone rules, all aircraft have to report flight plans, maintain radio contact and reply to identification questions by Chinese authorities.<br/> <br />China's declaration has been the subject of major disagreements between U.S., Chinese and Japanese diplomats in the past weeks.<br/> <br />To show their disagreement with China's air zone declaration, U.S., Japanese, and South Korean military aircraft have all breached the zone without informing Be
