The Ukraine has made the fight against terrorism a top priority in its policymaking. In recent years, the Ukraine has joined all major international conventions intended to prevent and counter international terrorism and organized crime. Measures taken to comply with these international agreements include the enactment of counterterrorist legislation and the organization of state agencies to address terrorist threats. The details of the measures are described in this paper. Similar actions have been taken in addressing the threat of transnational organized crime. The Ukraine has engaged in international cooperation in these domains through participation in the activities of various international organizations, including the United Nations Office for Drug Control and Crime Prevention, Group of Countries Against Corruption, Interpol, Europol, and Eurojust. Recent practical results of such cooperation include the Ukraine’s detaining of two foreign suspected terrorists who are wanted for committing serious crimes. Also, government agencies have detected 53 organized criminal groups and identified just over 200 members of organized criminal groups involved in human trafficking, drug trafficking, illegal labor migration, and economic crimes. International cooperation has led to joint operations, assistance from specialized law enforcement personnel in other countries, and the exchange of information.