North Korea has fired two unidentified ballistic missiles, the South Korean military said on Monday. North Korea launched the missiles from Jangyon, South Hwanghae Province, South Korean news agency Yonhap cited the general staff in Seoul (JCS) as saying. One missile flew about 600 kilometres, while the second flew about 120 kilometres, Yonhap reported. The launch came as North Korea warned of countermeasures against a joint military exercise held by South Korea, the United States and Japan. North Korea would “firmly defend the sovereignty, security and interests of the state and peace in the …