The article discusses the integration of Eurasian countries to form an economic union, starting from the Eurasian Economic Community to the Customs Union and the Common Economic Space. The main goal is to establish an Economic Union by 2015. In 2014, the Treaty establishing the Eurasian Economic Union was signed by three leaders, attracting global attention including Mongolia. The article focuses on the stages of Eurasian economic integration and Russia's role in the process.