Conventional warfare-clashes between large military forces-defined twentieth-century power. But today, facing a dominant American military, principal adversaries Russia, China and Iran, have adopted a new style of competition. Cyber attacks, covert action, proxy conflicts, information and disinformation campaigns, espionage and economic coercion-these are the tools of irregular or asymmetric warfare, which will increasingly reshape international politics. In Three Dangerous Men, defence expert Seth G. Jones profiles pioneers of irregular warfare in Moscow, Beijing and Tehran who adapted American techniques and made huge gains without waging traditional warfare. Drawing on interviews with dozens of US military, diplomatic and intelligence officials, such as CIA directors Michael Hayden and David Petraeus, the author demonstrates why the US abandoned its own irregular capabilities and is thus steadily losing ground to its global adversaries. Jones argues the US must significantly alter how it thinks about-and engages in-competition before it is too late.