NATO plans to mobilize 90,000 soldiers for a manoeuvre aimed at deterring Russian aggression, in the biggest exercise staged by the alliance since the end of the Cold War. According to information obtained by dpa on Thursday, the scenario for the Steadfast Defender exercise, which is due to start in Europe in February, is a Russian attack on allied territory that triggers Article 5 of the NATO treaty that enshrines the promise of collective defence. The focus of the drills will be on alerting and deploying national and multinational land forces in the event of a Russian attack. Article 5 has b…