She visited Singapore in June and then sailed to Australia where she participated the Talisman Saber exercise with Australian and other forces in July . She then made a port visit to Brisbane before returning to Japan on 9 August . On 8 September she departed Yokosuka again to conduct patrols off Korea after the North Korean missile launch over Japan and nuclear test . On 2 October the ship visited Hong Kong . She then participated in drills with the Japan Maritime Self-Defense Force off Okinawa . After that , '' Ronald Reagan '' participated in drills off the Korean peninsula with the South Korean Navy . After the drills , she made a port visit at Busan in South Korea
nuclear test
2017 North Korean nuclear test
USS Ronald Reagan