The UN refugee agency says more than 4 million refugees have fled Ukraine since the Russian invasion.
The new figures are posted on the UNHCR website. More than 2.3 million have arrived in Poland, but many have returned to other countries or to Ukraine.
Rescue workers say the numbers have dropped in recent days as more people wait for the war to develop. An estimated 6.5 million people have been displaced from their homes in the country.
More than 608,000 have entered Romania, more than 387,000 have entered Moldova, and about 364,000 have entered Hungary since the start of the war on 24 February, according to government estimates.
Since the start of the war, the UNHCR has estimated that about 4 million people could flee Ukraine – although it has repeatedly said it is re-evaluating its forecast.
“There are now 4 million refugees from Ukraine, five weeks after the Russian invasion began,” UN High Commissioner for Refugees Filippo Grandi tweeted as he crossed the border into Ukraine.
Grandi said he would stay in the western city of Lviv and discuss ways to increase support for “the victims and displaced people in this senseless war.”
The UNHCR team and its partners are working to provide protection, emergency shelter, cash assistance, basic relief supplies and other vital services to those who have fled.
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