(Reuters) – Ukrainian investigators have completed the exhumation of soldiers in one of two mass graves discovered after Russian troops retreated from the town of Lyman in eastern Donetsk region, police said on Friday. “Police have removed the bodies of 34 Ukrainian defenders from the mass grave,” Donetsk regional police said in a statement. “Work continues at a second location where more than 120 civilians are buried. The fate of each person who died will be determined.” The soldiers’ bodies have all been transferred to a morgue and will be returned to their relatives for burial once identifi…