The relevance of the research is due to the change in the monetary policy regime of the National Bank of Ukraine (NBU), which consists in the transition from inflation targeting with a floating exchange rate to a fixed exchange rate as the nominal anchor of monetary policy under martial law. Such a plan to change the monetary policy regime was carefully calculated and outlined in the NBU's Monetary Policy Guidelines for the Duration of Martial Law. The timeliness and effectiveness of the NBU's monetary policy decisions enabled it to mitigate the impact of the military shock on the macro-financial stability of the national economy. The purpose of the article is to consider the theoretical and practical aspects of the NBU's monetary policy under martial law. Methodology. The study uses a systematic method of cognition to determine the sequence of application of monetary policy instruments to smooth out monetary shocks of the wartime period; an abstract-logical method to understand the future monetary policy strategy based on the abandonment of the fixed exchange rate regime and a gradual return to inflation targeting; and a statistical method to analyse the dynamics of monetary indicators of the national economy. Results. The paper presents the main principles of the NBU's monetary policy under martial law. The first shock from the war led to changes in the conduct of monetary policy and a shift to unconventional instruments of its regulation. The gradual adaptation of the economy to the new conditions determined the NBU's further steps to ease monetary policy and move to greater exchange rate flexibility. Practical implications. The practical significance of the research results is to assess the conditions for the transition from the key policy rate-based inflation targeting regime as the main monetary policy instrument to the use of foreign exchange interventions as the main operation in the foreign exchange market under martial law. Value / Originality. The originality of the article is due to the need to identify the prerequisites for the transition to a new monetary policy strategy in a wartime economy. Conclusions. The NBU's timely response to the negative phenomena associated with deteriorating inflation expectations, multiple exchange rates and pressure on international reserves helped prevent the development of a currency and financial crisis in Ukraine. Despite the active hostilities, the NBU is trying to find options that will allow it to conduct an effective monetary policy in the face of a full-scale invasion and unprecedented internal and external shocks. Internationally, Ukraine has exceeded expectations and the NBU has shown a high degree of responsibility, professionalism and creativity in the conduct of monetary policy. Increased confidence in the central bank is a valuable resource in times of martial law.