The article evaluates the operational efficiency of Ukraine`s banking sector in the conditions of the growing influence of risks and threats during the war. The specifics of ensuring the operational efficiency of the banking system and the indicators characterizing it are determined. An analysis of the assets and credit activity of Ukrainian banks since the beginning of the Russian aggression was carried out. The causes of structural changes in banking activity for the relevant period have been determined. The financial performance of the banking system of Ukraine during the war period was assessed. Ways to optimize banking activity are proposed to ensure the growth of the level of efficiency of the banking sector