The agreement, signed in the Tajik capital Dushanbe, links the Shanghai Cooperation Organisation (SCO), to the Collective Security Treaty (CST), an alliance grouping seven former Soviet states including Russia.
"The memorandum will allow us to broaden cooperation between our similar organisations in security issues, in fighting crime and illegal drug traffic," SCO General Secretary Bolat Nurgaliyev said.
CST general secretary Nikolai Bordyuzha said confronting the West was not in the plans of the sister groups.The agreement was signed on the margins of a regular summit of leaders of the Commonwealth of Independent States, a loose confederation of former Soviet states, excluding the Baltic republics.