overcoming of threats to the national security. The spectrum of threats to the national security of the Republic of Latvia exceeds the competencies of defence and interior affairs system institutions. It means that to detect, prevent, and overcome threats to the national security the country has to involve all state administration bodies. Considering the great number of institutions involved, the centralised control of the national security policy and mutual cooperation of these institutions are very important factors. The fact that administrative institutions have a unified understanding about the term of national security, most common threats to the national security of the Republic of Latvia, and the most effective combating methods is of the same importance. Interinstitutional cooperation mechanisms must be effective daily, but each institution has to undertake the initiative to solve issues within the obligation framework of the respective institution. The understanding and support of the society is very important for the state administration institutions to implement the national security policy, however, such support and understanding can be ensured if the society in questioned is well educated in the specific field. Thus provision of information about the national security to the society is one of the priorities for implementing the national security policy. 3. Changes within the International Security Environment and the Effects on the National Security Since the approval of the previous Concept in 2011, the international security environment has undergone significant changes. It is characterised by instability and unpredictability, as well as formation of new conflicts, including those that are comparatively near the Latvian border. The aggression in Ukraine fuelled by the Russian Federation has presented significant challenges to the security in Europe and global international order. The aggression in Ukraine fuelled by the Russian Federation has been an unprecedented attack on the basic principles of the international rights since the end of WWII. These rights define, for example, execution of signed agreements, inviolability of borders, and territorial integrity. These basic principles establish the international relations of countries and have been the basis for peaceful coexistence in Europe after the war. Latvia together with EU and NATO has condemned and continues to condemn the actions of the Russian Federation in Ukraine, and has expressed that these actions are unacceptable and threaten the security of Europe. The actions of the Russian Federation have significantly worsen the security within the EuroAtlantic area and have created long-term effects on the national security of the Republic of Latvia. The aggression and policy carried out by the Russian Federation in the territory of