Almost 20% of scientists in Ukraine fled the country by the end of 2022 as a result of the Russian invasion that began in February of that year. That’s according to an investigation by Swiss and Ukrainian researchers at EPFL Lausanne, which also finds that 20% of those who stayed have been forced to move elsewhere in the country (Humanit. Soc. Sci. Commun. 10 856).

As of January 2024, the United High Commissioner for Refugees estimates that 6.3 million refugees have left Ukraine while a similar number of people have been internally displaced. Before the invasion, there were estimated to be some 100,000 scientists working in Ukraine. The study surveyed a total of 2559 Ukrainian active researchers who were employed at institutions of higher education or public research organizations when the war struck.

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