infrastructure into the object list of the critical information infrastructure; at the same time, providing holders with additional objectives regarding benefits of entrepreneurship. It is important that CERT.LV establishes a cooperation with the Internet service providers that are not the holders of the critical infrastructure. Mutual trust and common understanding about the necessity to increase the security level of all the Internet communications and infrastructures of the service providers must be developed. Institutions responsible for the cyber security must systematically and regularly organise intrusion tests, training and information exchange between all parties involved in order to increase the level of security not only in separate objects, but also in the information technology sector in general. Strengthening of the Interinstitutional and International Cooperation Institutions responsible for prevention of cyber threats must develop a close mutual and international cooperation. At the same time, these institutions have to strengthen cooperation with the private sector by establishing mutual understanding and assistance system for strengthening the cyber security in general and in the case o a cyber threat. Regular national level cyber security training is necessary to strengthen the response capacity and mutual cooperation, as well as increase understanding about the significance of cyber threats. Cyber threats do not recognise borders. These threats can be simultaneously directed towards not only the national security interests of the Republic of Latvia, but also towards NATO, EU, and international partners of Latvia. The international cooperation is a precondition for identification of serious cyber incidents, and this cooperation should be especially developed regarding partners form the Baltic states and Northern countries. The involvement of the Republic of Latvia in various international training operations and cyber attack simulations must be continued and the cooperation procedures with NATO have to be strengthen. 5. Conclusion The security environment in the world has changed and become unpredictable. The number of sources for new threats has grown, and the identification and planning of countermeasures create