The United States and South Korea held drills by allies after a provocative test launch Tuesday morning in exchange for missiles fired over Japan by neighboring North Korea without permission and early warning.
Prior to this exercise, Korea had fired a ballistic missile without warning at Japan in a significant extension of its weapons testing program.
The US and South Korea fired four missiles off the east coast of the Korean peninsula on Wednesday morning.
And the exercise has prompted the US and South Korea to initially respond to provocations with a precision bombing exercise on Tuesday. Fighter jet was also included. Firing from the air to the surface was told by the South Korean joint chiefs.