Krishna Thapa is a former Special Air Service troop leader, Gurkha, and record-breaking mountaineer.

The legacy of the UK’s involvement in Afghanistan is one of compounding whole-of-government failure.

British soldiers were sent to Afghanistan as part of an international deployment against al-Qaida and Taliban forces in the wake of the Sept. 11, 2001, attacks.

On Monday, pro-Kremlin news outlets and social media accounts published a bombshell report. Two British special forces officers and an MI6 operative had been captured in Ukraine by Russian ...

Also named were more than 100 British citizens, including MI6 agents and members of the UK special forces—among them, according to the Telegraph, a major-general and a brigadier.

Documents seen by the BBC suggest he was part of a special forces unit who worked with the British in Afghanistan.