Keir Starmer appears to be at odds with defence secretary John Healey.Keir Starmer has been told his defence spending review is “unravelling” amid a row over the government’s plans to increase the military budget.The prime minister announced in February that defence spending will increase to 2.5% of gross domestic product (GDP) by 2027, with the “ambition” of hitting 3% by 2034.Defence secretary John Healey appeared to confirm last week that the 3% target will definitely be hit, but Starmer refused to confirm that in an interview this morning.The apparent split threatens to overshadow the launch of the government’s strategic defence review (SDR) today.Starmer will confirm that the UK will build up to 12 new nuclear-powered submarines, as well as six new munitions factories and thousands more long-range weapons.But writing in the Telegraph, the authors of the SDR made cl