Marcus Birks, 40, died from Covid-19 after choosing not to receive a vaccine jab because of conspiracy theories he had read on social media, believing he could not get ill as he worked out.
Ben Grant, 30, who served in the elite corps for more than five years as a commando, was among a group of seven ex-servicemen to arrive in Ukraine over the weekend.
Speaking on Wednesday, Mr Wallace stressed that serving soldiers who travel to the war zone will face a court martial when they return and warned other Brits will not be there for a selfie and six weeks .
Dad, 50, going to Ukraine to fight because he's 'not doing much' hulldailymail.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from hulldailymail.co.uk Daily Mail and Mail on Sunday newspapers.