As Ukrainian counter-offensives gather momentum to try and win the city of Kherson back, inhabitants in certain Russian-occupied territories have been advised to leave. Russian forces are letting them out, including those in the region of Zaporizhzhia, or those from the devastated port city of Mariupol. But only refugees who pass time-consuming and stressful checks known as “filtration” manage to leave. FRANCE 24’s correspondents met some of them.