Description9/11 has been a milestone to redefine terrorism and how to counter it. It has been revealed that a global anti-terrorism alliance is required to overcome such an enormous threat for all countries. Thus, the UN has taken initiatives very effectively just following 9/11 by urging the entire world what to do against terrorism which is a common threat for humanity. A counter terrorism regime has emerged, and adopted mandatory regulations for member countries including Russia and Turkey. Having changed the perception and understanding of terrorism, the UN’s Counter Terrorism Committee (CTC) has been established as enforcement unit evaluating states’ stance towards terrorism, and recommending them how to fill the gaps in countering terrorism. Russia and Turkey have also submitted reports to the CTC, and made some counter terrorism regulation accordingly. Overall, the main assumption of this study, ‘the UN played a major role in counter-terrorism efforts following the events of 9/11’, has been examined through the related literature and interviews, and confirmed. Truly, the UN has become a global security actor, to some extent affecting counter terrorism policies implemented by Russia and Turkey