A teenage Subway worker from Warrington applied online to join the fight against Russia despite having no military experience.
Jamie, 19, left his family behind to fight with the Ukrainian Army over the weekend.
His family believe he was influenced to join the fight by what he saw online and by reports in the media - including comments made by Liz Truss which appeared to encourage those joining Ukrainians to fight.
Jamie's mum told ITV Granada Reports : "Every day now I'm just waiting for that phone call in the morning, or that text in the morning, to say 'I'm alive, I'm OK'."
Jamie reportedly contacted a London-based organisation last Friday about joining the fight in Ukraine, which replied saying he should only travel if he had relevant experience.
But the youngster responded, saying he had tickets to fly to Warsaw on Saturday, before he crossed the border into Ukraine.
"He's just a lazy teenager, a normal teenage boy," his mum told Granada Reports.
"He hasn't got any military experience or anything like that - it's just literally from Call of Duty.
"He did go to Army Cadets but he was only at the very early stages - he's never shot a rifle or anything like that."
Jamie's family told ITV they believe he was influenced by comments made by Liz Truss on a recent BBC interview, which was seen as a recently played video on his YouTube profile.
The Foreign Secretary told BBC One's Sunday Morning on February 27: "If people want to support that struggle [in Ukraine] I would support them in doing that."
Today (March 10), the Government has urged Brits not to travel to Ukraine to fight against Russia.
Defence minister James Heappey has warned British troops who go AWOL to fight in Ukraine risk Russia wrongly accusing the UK of being 'a belligerent' in the war.
He told Times Radio a 'very small number' of British troops, around three or four troops is the number he has heard, have gone to Ukraine.
And asked about the situation, Prime Minister Boris Johnson told reporters: “I think that everybody seeing what’s happening in Ukraine will understand those feelings and I think many people, many people in our armed forces, will sympathise because I don’t think I’ve ever seen such clear distinction in international affairs between right and wrong and good and evil in what President Putin is doing to people in Ukraine.
“But we have very clear laws in this country. You shouldn’t go to Ukraine, and I’m afraid people going from our armed services, as the Chief of the Defence Staff made clear the other day, will face court martial.”
More than 2.3 million people have fled Ukraine since the Russian invasion on the country began a fortnight ago.
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