The Red Army advanced into European countries in pursuance to its allied obligations, as well as based upon bilateral agreements with the governments of those countries in exile, or with the leaderships of the Resistance movement. The Red Army conducted 14 strategic offensive operations to liberate European countries, including such massive operations as the Byelorussian Strategic Offensive (2nd stage), Lvov-Sandomierz Strategic Offensive, Jassy–Kishinev Offensive, Belgrade Offensive, Budapest Strategic Offensive, Vistula-Oder Strategic Offensive, East Prussian Strategic Offensive, East Pomeranian Strategic Offensive, Vienna Offensive, Berlin Strategic Offensive, Prague Offensive. About 7 million military personnel of eight fronts and three fleets were involved in these operations. The Red Army fully or partially liberated 11 European countries. Its casualties amounted to 3 million soldiers and officers, of them 1 million personnel were killed in action.