A US soldier and a South Korean counterpart at a joint live fire exercise at Rodriguez Range  in Pocheon, South Korea, earlier this month. The US and South Korea had heightened their combined surveillance and intelligence-gathering efforts to prepare for a possible nuclear test by North Korea, a South Korean defence ministry spokesman said. Photograph: Chung Sung-Jun/Getty Images

With South Korea preoccupied by a ferry disaster, North Korea has increased activities at its main nuclear test site, prompting Seoul and Washi(...)

A  South Korean naval vessel in the sea off Daecheongdo, an island near the border with North Korea,  today. Photograph: Hong Hae-in/Yonhap/Reuters

An unmanned drone crashed on a South Korean island near a disputed maritime border with North Korea, a South Korean defence ministry official s(...)

North Korean People’s Army soldiers take part in a rally at the Kumsusan Palace of the Sun to swear allegiance to North Korean leader Kim Jong Un ahead of the second anniversary of the death of his father and former leader Kim Jong Il. Photograph: KCNA/Reuters.

North Korean leader Kim Jong Un’s execution of his uncle and de facto deputy raises the risk of “reckless provocations” from the north, South Korean p(...)

South Koreans look at  North Korean territory  at an observation post south of the demilitarised zone separating the two Koreas in Goseong. Photograph: Lee Jong-kun/Reuters

North Korea fired a short-range missile from its east coast today, a day after launching three of these missiles, a South Korean news agency sa(...)