By Hyonhee Shin SEOUL (Reuters) -North Korea fired multiple cruise missiles off its east coast on Sunday, its second such launch in less than a week, South Korea’s Joint Chiefs of Staff (JCS) said. The missiles were launched at around 8 a.m. (2300 GMT on Saturday) and were being analysed by South Korean and U.S. intelligence authorities, the JCS said, without specifying how many missiles were fired. “While strengthening surveillance and vigilance, our military is cooperating closely with the United States and monitoring additional signs and activities from North Korea,” it said in a statement….