The UK will not enjoy supremacy in the air in future warfare but will have to fight against an “ever-improving enemy” for control, the head of the Royal Air Force has warned, as he claimed that the UK faces the most difficult strategic environment in decades. Air Chief Marshal Sir Richard Knighton, chief of the Air Staff, suggested the era of unchallenged Western dominance in the air had come to an end, adding that it was imperative the RAF modernise its efforts to stay ahead of the likes of China and Russia.