SEOUL, April 17. /TASS/. The United States and South Korea have kicked off the Freedom Flag joint air exercise that will involve about 90 aircraft from both sides, the Yonhap news agency reports.

North Korea "will never tolerate the slightest sign of threat of ... as the United States and South Korea kicked off a two-week joint air exercise, called Freedom Flag, on Thursday.

North Korea "will never tolerate the slightest sign of threat of ... as the United States and South Korea kicked off a two-week joint air exercise, called Freedom Flag, on Thursday.