How severely has war reduced Ukraine's population and birth rate?
Core argument: Ukraine's population in government-controlled territory has fallen from about 37m to 27m–28m since Russia's full-scale invasion in 2022, with 3m–5m Ukrainians living under Russian occupation and millions more emigrated.
Births in Ukraine are falling, in part because there are fewer adults. Since Russia’s full-scale invasion in 2022 the population inside government-controlled territory has fallen from about 37m to 27m-28m. Around 3m-5m Ukrainians now live under Russian occupation, and millions more have emigrated. Ukraine’s president, Volodymyr Zelensky, puts combat deaths at over 50,000; an independent estimate is closer to 150,000. Thousands of civilians have been killed, and Russia has deported over 20,000 children to Russify them. Wartime, moreover, is not good for starting families. The fertility rate has dropped from 1.2 children per woman in 2020 to 0.8-0.9, lower than any big country but South Korea. The replacement rate, needed to keep the population stable, is 2.1. In the first half of 2026 deaths outnumbered births by more than three to one.

