It has been determined that legalization (laundering) of proceeds from crime as a criminal offense is committed by individuals and legal entities using a criminal (corruption) mechanism for granting the status of legal origin to assets (funds, real estate, securities) knowingly acquired by criminal means, in order to conceal predicate offense and the acquisition of legal grounds for possession, use and disposal of these assets. According to the Association Agreement between Ukraine and the European Union, combating these crimes is recognized as an element of security policy, which determines the feasibility of further appropriate changes to existing legislation and the need to improve the organization and methodology of investigation of these crimes. The assessment of the impact of offshore zones on the indicators of financial security of Ukraine based on the construction of an econometric regression model has been carried out. In accordance with the obtained results, recommendations on deoffshorization as an effective tool for ensuring the financial security of Ukraine have been provided. It has been stressed that international cooperation in the field of criminal justice should become an effective process and, having got rid of cumbersome and lengthy formal procedures, be transformed into an operational process of interaction between authorized persons. Operational cooperation between law enforcement agencies of Ukraine and EU countries, which is provided for in the Association Agreement, is complicated by the factor of inadequate communication due to the fact that law enforcement officers do not speak foreign languages and need training (both professional and language training).