The Foreign Office is investigating reports that a British national was detained by Russia after a video emerged showing a man in camouflage being questioned.

In the video, which was reportedly shown on Russian TV, the man appears to give his name as Andrew Hill. He speaks with an English accent, has his arm in a sling, a bandage around his head, and blood can be seen on his hand.

The video, which has not been verified, was shared online.

The Foreign, Commonwealth and Development Office (FCDO) is investigating the reports and is also supporting family members.

The FCDO condemns the exploitation of prisoners of war for political ends and demands that any detained person be treated with humanity in accordance with the requirements of international humanitarian law.

Two other British men, believed to be working as humanitarian aid volunteers, were also reportedly detained in Ukraine by Russian forces.

The Presidium Network, a non-profit group, said Paul Urey and Dylan Healey were captured early Monday morning at a checkpoint south of the city of Zaporizhzhia in southeastern Ukraine.

Paul Urey (Presidium Network/AP)

Mr Urey, born in 1977 and from Manchester, and Mr Healey, born in 2000 and from Cambridgeshire, traveled to Ukraine on their own, the organization said.

They weren’t working for the Presidium network, which helps deliver aid to Kyiv.

The organization said the couple were driving to help a woman and two children evacuate when they went missing.

Presidium Network said it was concerned Russian forces believed the pair were British spies.

The Foreign Office said it was urgently seeking more information following reports of British nationals being held in Ukraine.

Meanwhile, in an intelligence update on Saturday, the UK’s Ministry of Defense (MoD) said Russia faced “tremendous challenges” and troops were likely to suffer from “weakened morale. “.

Posting on Twitter, the Ministry of Defense said: “Russia hopes to rectify issues that have previously limited its invasion by geographically concentrating combat power, shortening supply lines and simplifying command and control.

“Russia still faces considerable challenges. It was forced to merge and redeploy exhausted and disparate units from failed advances in northeastern Ukraine.

“Many of these units are probably suffering from low morale.

“Gaps in Russian tactical coordination remain. A lack of unit-level skills and inconsistent air support prevented Russia from taking full advantage of its combat mass, despite localized improvements.