The Norwegian Border Guard confirmed to the BBC that a Russian man had been detained after crossing the country’s 198km (123miles) long border with Russia, but said it could not comment further for “reasons of security and privacy”.

Tarjei Sirma-Tellefsen, police chief of staff in the Norwegian region of Finnmark, said a man had been detained by a border patrol and said he had applied for asylum.

But the Russian human rights group Gulagu, who helped Mr Medvedev leave Russia, confirmed his identity. His escape is believed to be the first known instance of one of the group’s soldiers defecting to the West.

Gulagu’s founder Vladimir Osechkin told the BBC that Mr Medvedev had joined the paramilitary group in July 2022 on a four-month contract, but had deserted after witnessing a host of human rights abuses and war crimes while serving in Ukraine.