A man who travelled to Ukraine to fight claims he was held at gunpoint by special forces - and helped to arrest a Russian spy.Ethan Dennis, 21, who says he served in the Royal Navy, decided to travel east after Russia invaded.The former seaman signed up on March 2, six days after Vladimir Putin's forces began their assault.He says he went to the Ukrainian embassy but, unhappy with the red tape, decided to go it alone - flying to Rzeszów airport in southern Poland.From there he crossed the border into Ukraine with a group of ex-military Brits he met at the airport - spending 10 days fighting.Ethan, from Portsmouth, Hampshire, is now back in the UK after spending time on the frontline.And he has revealed just what he went through - including encounters with Ukrainian special forces and a Russian spy.