The number of Ukrainians who've fled to Poland is equal to the population of Warsaw

https://www.npr.org/2022/03/16/ [login to see] /ukraine-refugees-warsaw
About 3 million people have fled Ukraine since Russia's invasion began in February, the United Nations says — a remarkable pace that has placed Ukraine among the world's worst refugee crises.

As of Tuesday, 2.97 million people have left Ukraine since Feb. 24, according to UNHCR, the U.N. refugee agency. Another U.N. agency, the International Organization for Migration, said Tuesday that more than 3 million people have fled.

"The people who are coming over are in a bit more of a state of shock" compared to earlier arrivals after the invasion, said Matthew Saltmarsh, a spokesperson for UNHCR. "They've experienced conflict more directly in many cases. There often may be people with fewer means, with less financial support."

The lion's share have gone to Poland, where the number of refugees that have arrived – about 1.8 million – matches the population of the city of Warsaw, Poland's capital and largest city.