A total of 1 million people have fled Ukraine since Russia started its Ukrainian invasion less than a week ago, said the UN refugee agency.
The tally from UNHCR amounts to more than 2 per cent of Ukraine's population on the move in under a week.
The World Bank counted the population at 44 million at the end of 2020.
The agency cautions that the outflows are far from finished. It has also been predicted that as many as 4 million people could eventually leave Ukraine, and even that projection could be revised upward.
On Twitter, the UN High Commissioner for Refugees, Filippo Grandi, wrote, "In just seven days we have witnessed the exodus of one million refugees from Ukraine to neighbouring countries."
It may be mentioned, Syria currently remains the country with the highest refugee outflow at more than 5.6 million people, according to UNHCR figures. But even at the swiftest rate of flight by refugees out of Syria, in early 2013, it took at least three months for 1 million refugees to leave that country.
UNHCR spokesperson Shabia Mantoo said Wednesday that “at this rate” the outflows from Ukraine could make it the source of “the biggest refugee crisis this century.”