The UN says that as of 17 May, 1.8 million Ukrainians have returned to Ukraine. Ukraine's border force says people are crossing back into the country at a rate of about 30,000 a day.
This is often because areas of Ukraine such as the capital Kyiv, which were threatened by Russian army advances at the start of the war, are now considered safer.
Kyiv's mayor, Vitali Klitschko, says the city's population is back to two-thirds of its pre-war level.
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