South Korea, US revise deterrence agreement to counter North Korea

US and South Korean defence chiefs have updated a key military agreement against nuclear-armed North Korea for the first time in a decade as they hailed their "stronger than ever" alliance. US Secretary of Defence Lloyd Austin is in Seoul for an annual security meeting with his South Korean counterpart Shin Won-sik, as the allies ramp up their defence cooperation in the face of growing missile and nuclear threats from Pyongyang.