More than two million people have now left Ukraine, with around 250,000 of them currently in Warsaw. Poland can only take so much - and it's warned the European Union it needs more money to help.
The UN High Commissioner for Refugees has called it the fastest-growing refugee crisis in Europe since World War II.
Canadian journalist Fin DePencier crossed the Ukraine border to Poland by foot, a process which took twelve hours.
He spoke to Guyon Espiner.
