By Natalia Zinets KIEV (Reuters) - At least four Ukrainian servicemen and five coal miners were on Friday reported killed in the latest violence in the east of the country, where government forces are fighting pro-Russian separatists. The miners were killed after the bus they were traveling in came under mortar fire, Ukrainian television reported a doctor as saying, in the region of Chervonopartizansk near the border with Russia. Two soldiers and at least one border guard were killed after their armored vehicle drove over a landmine near Dovzhansky on Ukraine's border with Russia. Military spokesman Vladyslav Seleznyov said a soldier was also killed in an incident near the town of Karlovka in the region of Donetsk, the main city where rebel fighters are holding out against the government forces.