NATO has launched its biggest military exercises since the end of the Cold War, amid rising tensions with Russia. About 50,000 soldiers from 31 countries are taking part in a mock battle in Norway, against an invading force named Trident Juncture 18. The battle is scheduled to run until 7 November. NATO secretary-general Jens Stoltenberg said the drills would send a clear message to ‘any potential adversary’. Washington is contributing the biggest contingent of troops to the exercises, which are taking place just weeks after Russia staged its own largest-ever military drills.