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Reuters
Reuters
By Mike Collett-White and Stefaniia Bern KYIV -At a memorial service on Tuesday for four Ukrainians killed last year while carrying out a raid on Russian territory, ordinary soldiers rubbed shoulders with volunteer fighters of the Brotherhood Battalion to which those killed belonged. The ceremony, at the historic gold-domed St. Michael’s cathedral in central Kyiv, underlined the unclear relationship between irregular groups and Ukraine’s formal armed forces fighting against Russia. The groups’ role in the war is the focus of increasing scrutiny, after several videos purporting to show cross-bo…