This paper addresses the changes in the demographic development of Ukraine in the last 125 years in quantitative parameters of demographic sustainability: alterations in population size, its gender and age structure, and natural and migration movement. Demographic sustainability is considered to be the capacity of a country’s or a region’s demography to preserve a consistent population size with optimal proportions between its age categories. Eight historical-demographic stages related to specific military-political and socio-economic events are outlined and analysed. Demographic catastrophes and crises in Ukraine were directly related to the aggression of totalitarian regimes. They occurred at the initial stages of demographic transition, ...