“We need to be sensible and mindful and take whatever steps necessary,” she added.The former marine said he is “an extremely lucky man to have Claire as a wife”.He added: “We hear so many other stories of relationships going bad when you are inside. That hasn’t happened for us. Her love and support has simply sustained me.”Mrs Blackman told the BBC she felt a “huge relief” after her husband’s hearing yesterday, adding: “It’s been a long hard road.””We’ve experienced numerous disappointments along the journey so far we didn’t get our hopes up too high,” she said.A panel of five judges, headed by Lord Chief Justice Lord Thomas, sentenced Blackman, 42, from Taunton in Somerset, to seven years in jail following the recent quashing of his murder conviction for the 2011 killing.Announcing the decision, Lord Thomas said: “As with any person sentenced to a determinate term, his release will ordinarily be at the halfway point of the sentence.”Blackman, who watched Tuesday’s proceedings by video link, has already spent almost three and a half years in prison following his original conviction in November 2013.A member of Blackman’s legal team indicated he would probably be released in about two weeks, but the decision on the exact date will be determined by the Prison Service.The Court Martial Appeal Court ruled previously that Blackman was suffering from an “abnormality of mental functioning” at the time of the killing when he was serving with Plymouth-based 42 Commando battalion. The court ruled that the incident was not a “cold-blooded execution”, as a court martial had earlier concluded, but the result of an “adjustment disorder”.Mrs Blackman said her husband had never denied that his actions were “caused by a serious lack of judgment which we now know to be the result of a combat stress disorder”. “If he could turn the clock back and undo the moment he would do in a heartbeat,” she told the Today programme.”There are huge lessons to be learned in this case in so many ways – from the Court Martial process itself to the way our servicemen and women are supported during very stressful circumstances.”There has never been any official engagement from a senior level.” Claire Blackman said she was “overjoyed” at the outcome, having tirelessly campaigned for her husband’s release.She said: “This is the moment that we have all been fighting hard for. It is hard to believe that this day is finally here.”Mrs Blackman revealed that she and her husband have received advice on upgrading their security amid concerns from police over his safety.”I’ve had some really good advice and I’m always mindful of my security, but I don’t let it get in the way of my day-to- day living and I have taken appropriate precautions,” she told BBC Radio 4. Sergeant Blackman said his wife Claire’s support had “sustained” him during his time in jailCredit:Daniel Leal/AFP Royal Marine Alexander Blackman has spoken of his “profound sense of relief” as he is set to be released from prison in weeks amid reports he will receive police protection.The commando, who has spent more than three years in jail since being convicted of murdering a Taliban fighter, also paid tribute to his wife Claire for providing support that “simply sustained me”.Following an appeal, judges sentenced Blackman to seven years in jail for diminished responsibility manslaughter, so he could be freed next month due to the time he has already served.Blackman had been “braced for the worst” during the hearing at the Court Martial Appeal Court in London on Tuesday, he told the Daily Mail.”My heart sank when the judge started talking about my current sentence being the equivalent of 16 years, and I thought it was somehow leading to a larger sentence,” he said.”I just felt a profound sense of relief when they said seven.” Show more Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.