Leaders from the Commonwealth of Independent States (CIS) are holding a summit today in Kazan, the capital of Tatarstan. They are due to discuss CIS reform, the Nagorno-Karabakh conflict, and other issues. The meeting, hosted by Russian President Vladimir Putin, is expected to end with agreements being signed on terrorism, fighting extremist groups, and on curbing illegal migration. But the CIS is widely considered to be ineffectual in its goal of preserving close economic and defense ties between the former Soviet states. So why do the leaders keep meeting?