The International Organisation for Migration says more than 3 million people have fled Ukraine since Russian invaded last month. The new milestone also indicated that some 157,000 third-country nationals - people who aren't Ukrainian - were part of the outflow in what UN officials have called the largest refugee crisis in Europe since World War II.IOM spokesman Paul Dillon said at a UN news briefing in Geneva on Tuesday that the totals were compiled from figures provided by national authorities.The UN refugee agency UNHCR, which provides a more detailed count than the IOM though based on similar data, has reported that more than 1.8 million of the refugees were in Poland.