The authors analyze the range of security integrations in the post-Soviet area and their impact on security of the broader Euro-Asian region, the Balkans and Serbia. In that regard, they point to the main organizational aspects of security co-operation in the Euro-Asian space that have primarily resulted from the autochthonous initiatives from the states in the region within which they plan or develop specific common forces. The most significant results have been achieved within the Collective Security Organization (CSTO) that was established on the initiative of Russia and a part of the former Soviet Republics, as well as within the Shanghai Cooperation Organization (SCO), which was established on the initiative of Russia and China. Special emphasis in the paper is given to the security aspects of acting of the organizations mentioned above and their influence on Serbia and the Balkans, taking into consideration, above all, energy security.