The threat from North Korea increases after each successful test, therefore South Korea, Japan, and the United States practice missile defense

Two American warships, a South Korean destroyer, and two Japanese destroyers participated in missile defense exercises amidst heightened tensions in the region. North Korea conducted the drill only a few hours after firing a missile over Japan. Multiple missiles have been fired by Pyongyang in recent weeks.

The United States Pacific Command has stated that the trilateral exercise is evidence of the strength of the partnership between....