The multi-sided damages caused by the large-scale invasion of Russia has become a great challenge for the medical care system of Ukraine. This research is aimed at studying, analyzing and summarizing data from scientific publications, personal experience, and open sources of relevant information concerning changes that occur in the work within Ukraine’s healthcare system and the activity of medical staff due to the Russian invasion. Special attention has been paid to processes related to relocations of medical staff and health care establishments, field hospitals as an important tool during martial law, as well as for the different types of support provided by the international partners of Ukraine. Data concerning demographic shifts in Ukraine due to the 2022 Russia-Ukraine war are also presented. Moreover, SWOT analysis of changes in the system of health care in Ukraine during martial law has been performed. Keywords: health care system of Ukraine, healthcare quality, demographic shifts, internally displaced people, relocations, field hospitals.