How many refugees have fled Ukraine and where are they going?
More than two million people have now fled Ukraine because of the Russian invasion, according to the United Nations (UN).
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The UN High Commissioner for Refugees has called it the fastest-growing refugee crisis in Europe since World War Two.
How are refugees leaving Ukraine?
Trains heading towards Ukraine's border have been packed, and there have been long queues of traffic on roads leading out of the country.
UN spokeswoman Joung-ah Ghedini-Williams, who is in Warsaw, told the BBC it was mostly women and children making the crossing into Poland, with some facing waits of 24 hours. In some cases children were travelling with distant relatives or family members who returned to Ukraine after dropping them off, she said.
Refugees are told they do not need documents, but should preferably have their internal or foreign passports, birth certificates of children travelling with them and medical documentation.
What help are countries offering refugees?
In countries bordering Ukraine, refugees can stay in reception centres if they do not have friends or relatives to stay with. They are given food and medical care.
Reporting from the Polish border town of Przemysl, the BBC's Mishal Husain said there were signs offering help with healthcare and onward transport, with local hospitals delivering babies and treating sick and dehydrated children.
Poland's government has said it will need more money than the EU is currently offering in order to host the number of people arriving there, which is now more than one million.