By Josh Smith SEOUL (Reuters) -North Korea fired what could be a ballistic missile on Sunday, military officials in South Korea and Japan said, in what would be the first test since the nuclear-armed country conducted a record number of launches in January. South Korea’s Joint Chiefs of Staff reported that North Korea had fired a suspected ballistic missile toward the sea off its east coast from a location near Sunan, where Pyongyang’s international airport is located. The airport has been the site of missile tests, including a pair of short-range ballistic missiles fired on Jan. 16. The missi…