North Korea unleashes deadly ballistic missile salvo into the sea as it makes chilling threats of conflict and US - South Korean troops go on high-alert during military drills

North Korea launched several ballistic missiles toward the Yellow Sea on Monday afternoon, Seoul's military said, on the first day of a large-scale joint U.S-South Korea military exercise on the Peninsula.

Pyongyang has significantly expanded its missile tests over the past two years, while sharpening its rhetoric against the U.S. and South Korea.