What ever happened to "sharing is caring"? South Korea announced on Sunday that it is expanding its air defense zone for the first time in 62 years to include space also claimed by China and Japan. Air defense zones of all three countries now overlap in the East China Sea over a submerged reef that South Korea calls Ieodo (China calls it Suyan Rock). South Korea maintains a maritime research center there and the seabed around the reef is rich in natural gas and minerals. The move is a response to China's expansion of its own defense zone to overlap with South Korea's two weeks ago. South Korea's expansion is to take effect in one week.