Asymmetric wars require the search for new forms and ways to achieve goals in contemporary military conflicts. One of these forms is to support the capabilities of the security and defense sector (SFA) of NATO partner countries.The official materials of the last three NATO summits, the concept, doctrine and leadership of NATO define the principles of the SFA. This article is devoted to the implementation of SFA.The article is to analysis of SFA implementation measures.In line with the Strategic Concept of the North Atlantic Alliance, NATO is focused on addressing three key challenges, such as collective defense, crisis management, and security-based co-operation, in the interests of defense and security of its members.The NATO Summit in theUKidentified anotherAllianceactivity aimed at strengthening the capabilities of the security and defense sectors of the partner countries, called Security Force Assistance (SFA).According to the NATO guidelines, the SFA refers to the ability to "train and develop national forces in crisis zones" in order to "achieve the ability of the national authorities of partner countries to effectively support security without international assistance". SFA refers to "all NATO actions that develop, improve, or directly support the development of national security and defense forces and their associated institutes." Thus, in the general context, the SFA covers all measures aimed at the development and preparation of the national security and defense sector and is carried out at the tactical, operational, strategic, military-political levels, involves providing advisory assistance from a separate platoon to the ministry. In a wider context, the SFA, though having military orientation, includes such mechanisms for preventing contemporary military conflicts as political, economic, information, legal, and others.In order to implement the SFA, the leadership of theAllianceand individual NATO member states held a series of practical measures. So, at the end of2015, inconnection withRussia's aggression againstUkraine, NATO initiated the creation of a joint multinational group for the training of units for the Armed Forces and the Joint Multinational Training Group (Ukraine).TheUnited Statesbegan the formation of six security assistance brigades (SFABs) whose primary objective was to provide training, counseling, assistance, support and support for operations with coalition forces and partner countries. According to US military experts, the SFABs will achieve the following strategic goals: development of the capabilities of the security forces and defense of the partner countries, the release of regular military brigades from their unrelated functions, provision of, if necessary, the preparation of the infrastructure of the partner countries for the Allied Rapid Reaction Force.The Italian government decided in May 2017 to organize theNATOSecurityForceExcellenceCenterand its location in the capital of the country. It is anticipated that theCenterofExcellencewill be certified and will complete its tasks at the end of 2018.At the tactical level, in line with theAlliance's standards, the following tasks are addressed within the framework of the SFA:organization and conducting of targeted instructor-methodical exercises in accordance with the norms adopted by NATO with the units of the joint and airborne assault brigades, as well as the special forces special forces;familiarization of servicemen of partner countries with new models of weapons, military equipment, means of communication and navigation, and other special equipment;determine the level of readiness of formations for combat operations, taking into account the standards adopted by theAlliance.Along with this, the issue of improving the regulatory and legislative framework, according to which the number of foreign military advisers may, if necessary, be substantially increased to several thousand persons for the entire duration of the SFA operation is relevant.Conclusions. The North Atlantic Alliance is implementing an effective concept of support and development of the capabilities of the security and defense sector and its practical implementation mechanisms that address a wide range of security and defense issues of non-NATO countries. At the same time, implementation of such a concept requires from the partner countries changes in the regulatory framework and appropriate infrastructure preparation.In the following, an analysis of the individual mechanisms for implementing the concept of supporting the security forces at operational and strategic levels will be conducted.