Русско-англо-русский юридический словарь

The Commonwealth of Independent States (CIS; Russian: Содружество Независимых Государств, СНГ, tr. Sodruzhestvo Nezavisimykh Gosudarstv, SNG; also called the Russian Commonwealth) is a regional organisation whose participating countries are former Soviet Republics, formed during the breakup of the Soviet Union.

The CIS is a loose association of states. Although the CIS has few supranational powers, it is aimed at being more than a purely symbolic organisation, nominally possessing coordinating powers in the realm of trade, finance, lawmaking, and security. (Wikipedia)

A supranational union is a type of multinational political union where negotiated power is delegated to an authority by governments of member states. (Wikipedia)

supranational: involving more than one country, or having power or authority that is greater than that of single countries: NATO is a supranational organization. (Cambridge Advanced Learner's Dictionary & Thesaurus)