Four million refugees left Ukraine due to Russian invasion - UN

According to the UN, four million people left Ukraine because of the war

This is reported by the BBC with reference to the United Nations Refugee Agency.

As of March 30, 4,019,287 Ukrainians have fled abroad, hiding across the country's borders since the beginning of the February 24 invasion.

Now there are more than 2.3 million Ukrainians in Poland.