The US, South Korea and Japan have joined forces to conduct the first missile warning training exercise in order to protect Korea against increasing nuclear and missile threats from North Korea.
The move is part of the trilateral intelligence-sharing agreement (TISA) signed by the three countries to share missile detection and tracking information.
An Aegis combat system from each country will be used during the event.
Using computer and radar technology, the Aegis can track and guide weapons to destroy enemy targets.
During the exercise, the trajectory information of the phantom target detected by the three Aegis vessels will be shared via the inland relay station in Hawaii, the US.
An aircraft will also be deployed by the US to serve as a ballistic missile.
Republic of Korea Ministry of National Defense senior official said: "Missile defence participation involves a high level of cooperation across all stages, including missile development and production, deployment and operation.
"We are trying to ensure interoperability of information through this training, while independently establishing Kill-Chain and Korea Air and Missile Defense (KAMD)."
The US proposed the warning training exercise during Korea-US-Japan Defense Assistant Secretary level talks held in February, just after North Korea fired a long-range missile.