Cyberwar doctrine would be worthless if other nations don’t sign on to it as well, security experts say. U.S. officials are weighing up on a cyberwar doctrine, but experts say it would be valuable even without international cooperation. Cyberwar expert C. Robert Kline: “Doctrines of war need not be shared among powers, nor must they be agreed to by any second or third parties. They can just be,” he says. Cyber warfare expert: Developing devastating cyber weapons is much easier than conventional weapons like bombs and missiles.”]