By Tim Hepher PARIS (Reuters) – Airbus has launched a review of its defence strategy that could open the door to more strategic partnerships as Europe’s arms makers juggle security threats and pressure from some investors, people familiar with the matter said. The most far-reaching examination of defence goals in years is being spearheaded by the company’s board in a sign of growing independence from its government shareholders, though any major changes would need political backing of France and Germany. Top management of Europe’s biggest aerospace group strongly backs defence as a source of s…