"The Soviet Air Defence Forces (Russian: \u0432\u043E\u0439\u0441\u043A\u0430 \u041F\u0412\u041E, voyska protivovozdushnoy oborony, voyska PVO, V-PVO, lit. Anti-Air Defence Troops; and formerly protivovozdushnaya oborona strany, PVO strany, lit. Anti-Air Defence of the Nation) was the air defence branch of the Soviet Armed Forces. It continued being a service branch of the Armed Forces of the Russian Federation from 1991 to 1998."@en . .