Purpose of paper: This is a presentation of basic changes in the approach to the Corporate Social Responsibility (CSR) strategy of Ukrainian and Polish companies in the context of Russia’s military invasion of Ukraine, and their impact on business efficiency. This study was conducted to determine how businesses have changed CSR strategies based on the assistance provided. Design/approach: The paper is consisted with 3 parts. The first is about a theoretical context of CSR in Ukraine and Poland – as a short view of literature and practices related to topic, in the time of begging of War. The second part includes findings on research sample – questionnaire research among Ukrainian companies and their practices with CSR during the begging the War. The last part is an attempt of conceptualization own proposal of operationalization of CSR strategy in a time of war called Emergency Reflection Algorithm. Practical implications: The development of corporate social responsibility is one of the ways of strategic business development in achieving strategic goals, strengthening competitive positions in the market, building partnerships, establishing stable relationships between all elements of the internal and external environment of enterprises. Social implications: With the beginning of Russia's military invasion of Ukraine, there is an active participation of business in addressing the vital needs of civilians, military support, for Ukrainian citizens. Enterprises spend insane resources in material and financial terms in turbulent times of war. In general, understanding they bring emergency impact into a social surviving. The main subject of the research was the assessment of CSR practices in the face of a huge change, which was Russia's aggression against Ukraine. Findings: Half of the surveyed enterprises changed the strategic goals of CSR. In general, the primary goals are “Income” and “Use of material and financial resources: hire productivity of assets, better capital use, cost decrease”. The identified CSR strategy meets the criterion of measurability, and therefore all changes that are made to the current strategy or when formulating a new strategy must be adjusted to the strategic goals of CSR. Surveyed enterprises changed their strategic goals, while the rate of change in the strategic indicators of the positive contribution of CSR. This result demonstrates the need for changes in the enterprise management system. Originality/value: There was proposed the Business Model Canvas as tool to help forming/ adapting a CSR strategy. Keywords: CSR, Ukraine enterprises, war in Ukraine, sustainability management. Category of the paper: research paper, conceptual paper.