
The United Nations stated that more than four million Ukrainians have left the country since the start of the war.
According to UNICEF, half of the refugees are children. This figure is added to another 2.5 million children who have been internally displaced, meaning that 60 percent of children in Ukraine have been forced to leave their homes.
United Nations High Commissioner for Refugees Filippo Grandi visited a centre where refugees are staying in Ukraine's western city of Lviv.
He said numbers crossing the border into Poland have fallen and the situation "is not like it used to be".
"Now, it's a very fluid situation," he said. "Some people probably come to see their relatives, some people go to other countries, some people stay in Poland... I think everyone is waiting in hope for the war to end."
He called on donors to be flexible about where their money can be spent, given changing needs within Ukraine and countries like Poland. "We must be ready for any movement in this very difficult situation," he said.