Last week, foreign ministers from member-states of the Shanghai Cooperation Organization (SCO) gathered in Astana, Kazakhstan. The nine-member SCO — made up of China, India, Russia, Pakistan, Iran, Kazakhstan, Kyrgyzstan, Tajikistan and Uzbekistan — represents one of the largest regional organizations in the world. And with the SCO’s annual heads-of-state summit slated for early July, the ministers’ meeting offers an important glimpse into the group’s priorities going forward. USIP’s Bates Gill and Carla Freeman examine how regional security made its way to the top of the agenda, China’s evolving role in Central Asia and why SCO expansion has led to frustrations among member states.