SEOUL - North Korea fired a short-range missile from its east coast on Sunday, a day after launching three of these missiles, a South Korean news agency said, ignoring calls for restraint from Western powers.Launches by the North of short-range missiles are not uncommon but, after recent warnings from the communist state of impending nuclear war, such actions have raised concerns about the region's security."North Korea fired a short-range missile as it did yesterday into its east sea in the afternoon, " South Korea's news agency Yonhap reported, citing a military official.A South Korean defense ministry official confirmed the Yonhap report, but did not provide any details.