North Korea launched at least 23 missiles on Wednesday, the most it's ever fired in a single day.
According to multiple reports, South Korea issued an air raid alert for the first time in years.
The missiles — all short-range ballistic missiles or surface-to-air missiles — were fired from North Korea's eastern and western coasts, according to the South's Yonhap News Agency.
Additionally, Seoul's military noted that the North fired over 100 artillery shells into the ocean.
North Korea, however, has long bristled at these types of exercises, characterizing them as preparations for an invasion.