TR CU (EAC) Technical Regulations Full Guide 1. Basic Definition TR CU = Технические регламенты Таможенного союза English: Technical Regulations of the Eurasian Customs Union / EAEU Technical Regulations Unified mandatory safety laws for the 5 EAEU member states: Russia, Belarus, Kazakhstan, Kyrgyzstan, Armenia Legal authority: Issued by the Eurasian Economic Commission (EEC), directly override all national GOST-R / GOST-K / GOST-BY standards Compliance outcome: Products passing assessment get EAC marking, with either TR CU CoC (Certificate) or TR CU DoC (Declaration) Core rule: If your product falls under any TR CU regulation, national GOST certification is invalid for customs clearance; only EAC is accepted.