South Korean and U.S. troops held joint future combat drills involving drones, an unmanned vehicle and wearable laser sensors this week as part of efforts to modernise their militaries, Seoul's army said on Saturday.
North Korea fired an unspecified ballistic missile on Wednesday, the South Korean military told Yonhap news agency, with the launch coming as the United States and South Korea stage joint military drills.
Pyonyang has repeatedly underlined it goes ahead with missile tests in response to what North Korea describes as provocative war games carried out by Japan, South Korea, and the US.
EXCLUSIVE: The joint military exercise - the Ulchi Freedom Shield - is sending unequivocal messages to North Korea and China as fears of all-out war in the region surge.