Ukraine's critical infrastructure includes various sectors such as energy, transportation, telecommunications, water supply, health facilities and similar systems that are crucial for the country's stability and economic prosperity. Following the armed invasion of the Russian Federation, critical infrastructure facilities of Ukraine have become the target of frequent terrorist attacks and sabotage, which poses a serious challenge to national security and stability. The research first analyzed the challenges and threats that threaten the viability and functionality of the critical infrastructure of Ukraine and the functioning of the critical infrastructure protection system, where the main tasks of the critical infrastructure protection system of Ukraine and the mode of operation of the critical infrastructure protection system during the duration of a certain danger were described. The next important step in the research was related to the analysis of the response of the critical infrastructure protection system of Ukraine to Russian terrorist attacks, where a kind of list of terrorist attacks by the Russian Federation on various objects of critical infrastructure of Ukraine was made. After the observed problems and shortcomings of the critical infrastructure protection system of Ukraine, in the final part of the research, reforms of the critical infrastructure protection system of Ukraine were proposed with a focus on the reform of the armed forces of Ukraine and the reform of the cyber security system. Also, in order to ensure the resilience and functionality of critical infrastructure facilities, reforms to the critical infrastructure protection system of Ukraine were proposed, consisting of a series of measures and policies aimed at preserving the safety and functionality of key sectors.