The latest launch of ‘trash balloons’ by Pyongyang led to flight suspensions at Seoul’s main international airport South Korea’s military has vowed a “stern” response if North Korea “crosses the line” with its campaign of sending trash-filled balloons onto its neighbor’s territory, local media reported on Monday. The two countries have been deploying inflatables as part of their long-running confrontation. The warning on Monday came after a barrage launched by Pyongyang between Sunday evening