POKROVSK, Ukraine (AP) – Local officials say Russian and Ukrainian troops are engaging engaged in close-quarter combat in an eastern Ukraine city. They reported that Russian forces were “storming” the eastern city of Sievierodonetsk on Sunday and that the fighting has knocked out power and cellphone service and terrorized civilians who haven’t fled. Sievierodonetsk has emerged as an epicenter of Russia’s quest to conquer Ukraine’s industrial Donbas region. Russia also stepped up its efforts to take nearby Lysychansk, where Ukrainian officials reported constant shelling. The two cities are the last major areas under Ukrainian control in the Luhansk province, which together with neighboring Donetsk makes up Ukraine’s industrial Donbas region.