“I kind of feel like I’m on an awesome very dangerous vacation,” he said. And in another tweet: “When I need to amp myself up for battle, I just think about the most punchable face on the planet … Tucker Carlson.”

Two video clips featuring US fighters appeared on Twitter on Thursday: one showing an American in combat gear posing in front of the burnt remains of what he said was a Russian tank. Off camera, a Ukrainian shouts “Welcome to America!” and the American repeats the phrase.

In the other, narrated by a different soldier with an American accent, shows a detachment of soldiers taking cover by a wall alongside a road, in a village the narrator claims they have recaptured from the Russians.

“I kind of feel like I’m on an awesome very dangerous vacation,” he said. And in another tweet: “When I need to amp myself up for battle, I just think about the most punchable face on the planet … Tucker Carlson.”

Initial accounts of the international legion suggested that the foreign volunteers were a mixed bag, many with no experience. The military news website Task&Purpose reported there was “a swarm of Fantasists for every one candidate with experience in combat”.

“Selection apparently follows no discernible process other than separating those that don’t have military experience from those that do. The former are put through a four-week training course – the latter are given a weapon and sent to the front in ad-hoc units with a Ukrainian officer,” the report from Ukraine said.

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