Max Thunder(맥스 선더) is a joint U.S.– South Korean military exercise that began in 2009. In 2017, it began on 21 April 2017. [1] North Korea responded with the largest ever live fire exercise on 26 April 2017 in Wonsan. [2]
In May 2018, North Korea temporarily canceled high-level talks with the South because of Max Thunder. [3]