According to the UN's refugee office, more than 4 million refugees have fled Ukraine since Russia's invasion began. More than half of them have crossed into Poland, followed by Romania and Moldova. The UN further estimates that a "large number" of those refugees have continued on to other European countries as they are allowed to move freely within the Schengen zone of the European Union with few border controls.
References
- Ukraine Refugee Situationdata2.unhcr.org
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