who was the leader of the soviet union in 1945?
(JOIN (R government.government_position_held.office_holder) (AND (JOIN government.government_position_held.time_macro 1945^^http://www.w3.org/2001/XMLSchema#date) (AND (JOIN government.government_position_held.basic_title m.0fkx3) (JOIN (R government.governmental_jurisdiction.governing_officials) m.05vz3zq))))