investigated without the participation of various
units both in Ukraine and abroad. It is stated that
interaction is one of the main prerequisites for
ensuring any activity, and even more so for the
implementation of criminal proceedings of any
category. At the same time the issue of
interaction was left out of the attention of
legislators in terms of establishing the relevant
rules in codified legal acts. On the other hand, the
scholars defined interaction in view of the
existing system of law enforcement agencies and
their inherent functions. It is noted that the clear
and organized interaction of law enforcement
agencies of both a specific state and interstate
structures plays a significant role in the
effectiveness of the investigation of illegal acts
of the studied category. The possibility of
interaction between only indicated persons is
pointed out (investigator and case officer; several
investigators; several case officers; detective and
operative; several detectives). Emphasis is
placed on an essential feature of interaction –
single management by a specific authorized
person. Attention is focused on the mandatory
involvement of international law enforcement
organizations – Interpol and Europol. It is found
that the interaction of law enforcement agencies
with justice will ensure a certain effectiveness in
preventing the commission of illegal acts. The
concept of law enforcement cooperation during
the investigation of crimes committed by
transnational organized criminal groups is
formulated as a system of independent actions
with respect to the reporting lines of authorized
units, which is based on relevant legislation and
agreed between them on the purpose and
circumstances, which lies in effective and rapid
combination of the methods and means specific
to the relevant units, aimed at preventing and
investigating crimes under a single management.
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