He was just an 18-year-old student when Russia invaded Ukraine but within weeks, Ben Atkin had crossed the border into Ukraine with an intention to fight and an acceptance he might not come back. (Subscribe: https://bit.ly/C4_News_Subscribe)

As the youngest known Briton to travel to Ukraine to join the war, it might not come as a surprise that what he found there shocked him.

But even for a 30-year-old former Royal Naval engineer like Curtis, the Foreign Legion was not what he expected.

In this Channel 4 News investigation, we hear the previously untold accounts of chaos in Ukraine's Foreign Legion - with claims of poor organisation, a lack of training and kit and unverified claims that more British volunteers have been killed, than reported by officials.

The Foreign Office told Channel 4 News they don't know exactly how many British citizens have travelled to Ukraine or how many have lost their lives.

Warning: This report contains some strong language.

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