NEWYou can now listen to Fox News articles! China, Russia, Iran and North Korea are acting as a strategically aligned bloc even without a formal mutual-defense treaty, according to a new Foundation for Defense of Democracies book warning that their cooperation could leave the United States confronting multiple crises simultaneously.The book, "Axis of Aggressors: Countering the Cooperation of China, Russia, Iran and North Korea," examines how the four authoritarian governments support one another across military, economic, cyber and technology domains.Its authors acknowledge that the grouping is not a NATO-style alliance. It has no unified command, comprehensive defense commitment or complete…