Three soldiers were killed and 16 were injured in a powerful blast at a barracks in the western Russian region of Belgorod. A further eight men have been missing since the incident, which occurred on Saturday in the region bordering Ukraine, the Russian state news agency Interfax reported on Sunday, citing rescue services. A fire broke out in the building after a non-commissioned officer accidentally detonated a hand grenade. He was hospitalized with serious injuries, the report said. The man was holding the grenade at the barracks near Korocha in order to gain authority over military personne…