The paper deals with the problem of foreigners' rights and freedoms protection during the criminal procedure in The Republic of Kazakhstan. The comparative analysis of national and international legal framework shows that principles of legal defense of foreigners' interests do not have a practical application. Examining the content of requests on legal assistance received by the General Prosecutor's Office of the Republic of Kazakhstan in 2012-2015, the authors determine that about 20% of the orders relate to the admission of representatives of the competent authorities of foreign states. The study also proposes the amendments to the determination of rights and duties of a representative of a foreign state. The practical value is that the research can be a theoretical basis for further development of effective legislative mechanisms of the foreign citizens' interests' protection in Post-Soviet countries and other states referring to the Romano-Germanic legal system.