Introduction. In the context of economic globalization and continuous changes in the global economic order, understanding the mechanisms of financial interaction and effective implementation of innovations becomes critical for ensuring sustainable development of countries and enterprises. It is particularly important during periods of post-war reconstruction and integration processes, when economies require rapid adaptation to new conditions, recovery, and further development. The purpose of the paper is to identify and evaluate the effectiveness of various financial and innovative strategies aimed at supporting economic development and adaptation to new conditions. Results. The study revealed key strategies, including international borrowing, financial system reform, incentives for the private sector, development of infrastructure for innovation, cooperation among different sectors of the economy, and activation of international integration. These strategies are crucial for navigating through periods of economic transformation and leverage opportunities for sustainable growth and innovation. The successful implementation of financial interaction and innovation strategies will not only contribute to economic recovery and development in the context of post-war reconstruction and European integration but will also ensure long-term competitiveness and economic security of countries in a complex and rapidly changing world. Conclusion. Financial interaction and innovation strategies play a pivotal role in ensuring sustainable development and adaptation to global economic conditions. They require states and enterprises to demonstrate flexibility and an innovative approach. The findings emphasize the importance of an integrated strategy that incorporates international experiences, financial and regulatory reform, and strong public-private partnerships to foster innovation and economic resilience in the face of globalization and technological change.