The US policy towards North Korea is shaped by the nuclear non-proliferation policy and security guarantees provided to Japan and the Republic of Korea. These guarantees have a dual purpose. On the one hand, they are a tool to deter the DPRK from aggression against other countries in the region and, above all, US allies – Japan and South Korea. On the other hand, these guarantees are also an assurance of the latter's abandonment of the policy of acquiring a nuclear arsenal. The aim of the article is to analyze the foundations of Washington's policy towards Pyongyang and its influence on relations with allies through the prism of the theory of extended nuclear deterrence. It is stated that the effectiveness of deterrence consists of the conviction of the willingness to react with an adequate response. At the same time, the persuasiveness of extended deterrence is lower, as the protecting state must respond to threats from the ally that is to say outside its own national borders. There is controversy among scholars who reflect on the relevance of extended deterrence during the Cold War and in the modern security environment. It is noted that the emergence of new threats and an increasing number of conflicts, if any, change the nature of extended deterrence, but this does not diminish the importance of the "nuclear umbrella" of the United States for both the NPT and the security of the region. The author analyzes the reasons for the United States' security guarantees for South Korea and Japan. Particular attention is paid to the factor of North Korea's aggressive policy and its progress in the development of the nuclear missile program. With the reduction and withdrawal of US troops from Japan and South Korea, Pyongyang's destructive policies have exacerbated the American allies' sense of danger and provoked talks about developing their own nuclear programs. This scenario threatened the NPT regime and international stability, as well as US strategic interests in the region. Therefore, Washington is stepping up cooperation with its allies in the process of resolving the problem of North Korea's nuclear missile program and is officially reaffirming its unwavering security and defense commitments, which should restore trust between the parties and increase the role of extended deterrence in general.
US POLICY TOWARDS NORTH KOREA THROUGH THE PRISM OF THE THEORY OF EXTENDED NUCLEAR DETERRENCE