UN aid agencies are projecting that up to five million Ukrainians could flee to surrounding countries. At least 100,000 people have already been displaced by the Russian invasion, the UN refugee agency says. Around half of them left in the last 48 hours.
Poland, Moldova, Romania, Hungary and Slovakia have all reported Ukrainians crossing their borders.
Polish authorities say 35,000 people entered Poland since Thursday as long queues have built up near the border crossings.
Poland has said that it is willing to take up to a million Ukrainian refugees. The UN has warned that nearly three times that number could be headed just to Poland in the coming days.
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