US ambassador to South Korea Mark Lippert  covers a wound to his face as he leaves the Sejong Cultural Institute after he was injured in an attack by an armed assailant. Photograph: Yonhap/AFP/Getty Images

North Korea has described a knife attack that left the US ambassador in Seoul with an 11cm-long facial wound as “just punishment” for joint US-South K(...)

Ashton Carter, US president Barack Obama’s nominee to be secretary of defence, during a Senate Armed Services Committee nomination hearing in Washington. Photograph: Andrew Harrer/Bloomberg

President Barack Obama’s choice to be the next US secretary of defence has said he would be “very much inclined” to send lethal arms to the Ukrainian (...)

 Luke Somers photographed in  Sana’a, Yemen, in 2013. Photograp: EPA

A woman, a 10-year-old boy and a local al Qaeda leader were among at least 11 people killed alongside two Western hostages when US-led forces fought (...)

US defence secretary Chuck Hagel arrives  in Kabul, Afghanistan. Photograph:  Mark Wilson/Getty Images

With striking optimism, Chuck Hagel said on his final visit to Afghanistan as US defence secretary that he believes Afghans will successfully put dow(...)

US President Barack Obama is expected to nominate former Pentagon official Ashton Carter as US defence secretary, CNN reported on Tuesday. Photograph: Yuriko Nakao/Reuters.

US President Barack Obama has chosen Ashton Carter, a seasoned Pentagon official, to be his fourth defence secretary, succeeding departing secretary C(...)

Outgoing US defence secretary Chuck Hagel: reported to have resigned under pressure from a White House eager to project more assertive responses.  Photograph: Chip Somodevilla/Getty Images

Chuck Hagel, president Barack Obama’s defence secretary, has stood down after less than two years in the job in a sign of increased unease at the W(...)

US president Barack Obama  listens to defence secretary Chuck Hagel after the president announced Hagel’s resignation at the White House. Photograph: Kevin Lamarque/Reuters

US defence secretary Chuck Hagel resigned on Monday, the first major change to president Barack Obama’s Cabinet since his Democrats were routed in m(...)

Iraqi security forces in a sweep  against IS militants   north of Baghdad yesterday.   Iraq will need about 80,000  troops to retake the terrain it lost to IS, a top US general said yesterday. Photograph: Reuters

The top-ranking officer in the American military said yesterday the United States is actively considering the direct use of troops in the toughest for(...)

US president Barack Obama predicted “periods of progress and setbacks” in the war against Islamic militants in Iraq and Syria as he sought to demonstrate a unity of purpose during an unusual face-to-face meeting with senior military chiefs from 21 nations.

US president Barack Obama predicted “periods of progress and setbacks” in the war against Islamic militants in Iraq and Syria as he sought to demonstr(...)

Kurdish refugees from the Syrian town of Kobani in the southeastern town of Suruc, Sanliurfa province today. Photograph: Umit Bektas/Reuters

Fierce fighting is said to under way in a Syrian border town where Kurdish militiamen are struggling to repel advances by the Islamic State group.The (...)