S. Korea test fires 800km-range missile

South Korea has successfully test-fired a home-developed ballistic missile with a range long enough to hit any part of North Korea, Yonhap news agency reported Thursday.It comes a day after the North fired its own ballistic missile into the Sea of Japan -- which analysts dubbed a warning ahead of a China-US summit, at which Pyongyang's accelerating atomic weapons programme is set to top the agenda.South Korea is protected under an American security umbrella and is home to thousands of US troops.