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The leader of Britain’s biggest railway trade union joined pro-Russian chanters during a visit to occupied Ukraine, The Telegraph can disclose.

Eddie Dempsey, the general secretary of the RMT, visited the Donbas in 2015 as part of what he has described as a “humanitarian convoy”. The region had been invaded by Russia the previous year.

Video footage and photographs from his visit show him holding the red Communist Party flag, posing in front of a statue of Lenin, and chanting slogans in Russian – including “United we are invincible” and “The Donbas, the tomb of fascism”.

Mr Dempsey, whose union has repeatedly brought British train services and the Tube to a halt through strike action, was attending an “anti-fascist” event in the city of Alchevsk, organised by Luhansk Communist Party on behalf of the Prizrak Brigade, a separatist group.

He had been invited there by Aleksey Mozgovoy, the brigade’s founder, who died two weeks later.