This article discusses key areas of harmonization of administrative legislation and administrative responsibility between the Russian Federation and the Eurasian Economic Union (EAEU) countries. The most important issue in modern law is understanding that the uniform practical application of consistent administrative liability will enable the creation of a customs, tax, technological, and environmental space in the EAEU and BRICS. The author, on the basis of the findings of other researchers, gives an original definition of legal and administrative liability, which can be used in the harmonization of Russian legislation with the legislation of other BRICS and EAEU countries. The author also determines the regulation of the administrative process and the difference between administrative liability and other types of legal liability in accordance with modern Russian legislation.