In the context of expanding the range of interaction of defense companies with the market environment, it is important to improve approaches to assess their economic and financial security to identify importance, and impacting vectors of external factors, and propose timely response to their impact. There is a need to improve and implement integrated rating approaches to assess and increase their adequacy to modern market conditions, increase efficiency of that assessment and determine a number of indicators for its performance. With this in mind, the method and indicators of rapid assessment of the state of financial and economic security of defense enterprises are proposed. The rapid assessment results in the calculation of an integrated indicator of financial and economic security of an enterprise, which takes into account the indicators of interaction of the enterprise with the business environment, which indirectly reflects their impact. To interpret the results of the assessment of the integrated indicator, the mathematical distribution of the set of points in a quarter was used. The results of the rapid assessment of financial and economic security at 11 domestic defense companies has indicated improvement of their financial and economic security values with the beginning of the military conflict in the Eastern Ukraine and confirmed indirect impact of enterprises' active interaction with the external partners on their economic and financial security (by boosting exports-imports contracts, establishing partnerships with suppliers/consumers, government relations with the state, etc.).