Imangali Nurgaliuly Tasmagambetov is a Kazakh politician and diplomat, who is the current Secretary-General of the Collective Security Treaty Organization since January 2023. He was the Kazakh Ambassador to Russia from 2017 to 2019. He was Deputy Prime Minister of Kazakhstan from 2016 to 2017 and Minister of Defense of Kazakhstan from 2014 to 2016. He was the akim of Astana from 2008 to 2014 and from 2004 to 2008, as akim of Almaty. Before that, from 2002 to 2003, he was the Prime Minister of Kazakhstan.

The Collective Security Treaty Organization (CSTO) is an intergovernmental military alliance in Eurasia consisting of six post-Soviet states: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, and Tajikistan, formed in 2002. The Collective Security Treaty has its origins in the Soviet Armed Forces, which was replaced in 1992 by the United Armed Forces of the Commonwealth of Independent States, and was then itself replaced by the successor armed forces of the respective independent states.