Serhii Nuzhnenko, RadioSvoboda.org via RFE/RL Ukrainians board an evacuation train in Pokrovsk, Donbas, on August 7. Russian soldiers have reportedly taken people at gunpoint from trains and buses to filtration centers. Mariupol resident Viktoria Levashina was hoping to have a relatively easy time passing through the Kremlin-imposed process for weeding out “undesirable” Ukrainians living in...