SEOUL (Reuters) -North Korea fired multiple unidentified cruise missiles on Tuesday into the sea off its west coast, South Korea’s military said, the third time Pyongyang has tested cruise missiles in less than a week. The missiles were launched at around 7 a.m. (2200 GMT on Monday), Joint Chiefs of Staff said in a statement. South Korean and U.S. intelligence authorities were closely monitoring the situation and analyzing the details of the launch, it said. The launch comes amid a rise in tension on the Korean peninsula and follows a barrage of cruise missiles fired by Pyongyang off its east …