http://histrf.ru/read/articles/zimniaia-voina-panika-i-zhiestokost-finskoi-armii
September 18, 1934: The USSR joined the League of Nations. Just a few days before, the Soviet Union had received an invitation to join the League and "offer its valuable cooperation". Thirty-nine members of the organization voted in favor of admitting our country, while three (the Netherlands, Portugal, and Switzerland) voted against.