This book is a documentary story about the Ukrainian Insurgent Army. The appearance of this book is not at all accidental. Now, when attempts are made to rehabilitate and falsify the activities of Ukrainian nationalists during the Great Patriotic War, this book seems more than relevant, it will be interesting to the widest audience who want to know the whole truth about the OUN, UPA and Volyn massacre. The book by A.V. Kozlov "The whole truth about the Ukrainian Insurgent Army (UPA)" was prepared for a wide readership in order to counter attempts to distort history to the detriment of Russia's interests. The work considers modern methods of falsifying the history of the armed confrontation between Ukrainian nationalists and the Red Army in the western regions of Ukraine in the 40-50s. XX century