Other important advances occurred in late 1944, such as the invasion of Romania in August and Bulgaria. The Soviet Union declared war on Bulgaria in September 1944 and invaded the country, installing a communist government. Following the invasion of these Balkan countries, Stalin and Churchill met in the autumn of 1944, where they agreed upon various percentages for "spheres of influence" in several Balkan states, though the diplomats for neither leader knew what the term actually meant. The Red Army also expelled German forces from Lithuania and Estonia in late 1944 at the cost of 260,000 Soviet casualties.