Kaliningrad is the administrative centre of the oblast. The city serves as the administrative center of Novgorod Oblast. Volgograd is the administrative center of Volgograd Oblast. Administratively, Sevastopol was a municipality excluded from the adjacent Crimean Oblast. Vladimir is the administrative center of the oblast. It functions as the administrative center of Kherson Oblast (province). Yerevan served as the seat of the newly formed Armenian Oblast between 1828 and 1840. The territory became part of the Ukrainian SSR as Chernivtsi Oblast (province). Kirov is the administrative center of the oblast. Ecological situation in the Moscow Oblast is serious. The Karelian Isthmus belongs to the Leningrad Oblast. The city became the capital of the newly formed Lviv Oblast. Astrakhan is the administrative center of the oblast. Tula serves as the administrative center of the oblast. Yekaterinburg is the administrative centre of Sverdlovsk Oblast.