Summary: Since the beginning of the Russian invasion, almost 4 million Ukrainian refugees have fled into Poland, where they've generally received a warm welcome. But at the same time, Poland is trying to deter thousands of migrants from the Middle East and elsewhere from entering, often by using violence. Ali Rogin reports on one Afghan refugee whose journey shows not all migrants are treated equally. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
