Peter Romaniuk examines the history and current patterns of counter-terrorist co-operation and uncovers under what conditions states cooperate to suppress terrorism as well as how existing international institutions have been affected by the US-led ´global war on terror´, launched after the 9/11 terrorist attacks. The analysis includes a wide spectrum of institutions from the United Nations and its various bodies to military, intelligence and law enforcement agencies and looks at the full range of counter-terrorist activities from the use of intelligence and military force to criminal law measures, financial controls and diplomacy.