Ukraine's population has declined by 10 million, or around a quarter, since the start of Russia's invasion as a result of refugees leaving, collapsing fertility, and war deaths, the United Nations said. The birth rate has plummeted and is currently at around one child per woman, which is one of the lowest in the world. A precise accounting for the impact of the war on Ukraine's population would have to wait until after the conflict ended when a full census could finally be carried out. The largest chunk of Ukraine's population decline was accounted for by the 6.7 million refugees now living abroad, primarily in Europe. War deaths were also a factor.