十月革命后芬兰独立。芬兰独立后它和英、法、德等国关系密切。1939年德国入侵波兰之后,苏联担心芬兰被德国利用,要求芬兰割让部分领土,遭到拒绝。1939年11月30日苏联对芬兰发动进攻。苏军进入芬兰后被极端严寒的天气困住,其庞大的军事力量无从施展,反遭到芬兰军队机动灵活的行动打击,损失惨重。1940年,苏军改变原定计划,1月7日,它依仗强大的空军和炮兵对芬军阵地大举进攻,2月12日,苏军突破芬军防线。3月11日,苏军占领维堡。芬兰政府企图向英法求援,但德国不愿英法介入斯 Finnish independence after the October Revolution. After Finland’s independence, it has close ties with Britain, France and Germany. After Germany invaded Poland in 1939, the Soviet Union feared that Finland was used by Germany and demanded that Finland cede some of its territory and was rejected. November 30, 1939 Soviet attack on Finland. After entering Finland, the Soviet Union was trapped in extremely cold weather and its huge military power was unable to exert its influence. The Soviet army was hit hard by the flexible action of the Finnish army and suffered heavy losses. In 1940, the Soviet Army changed its original plan. On January 7, it relied on the mighty Air Force and artillery units to attack the Finnish military positions on a massive scale. On February 12, the Soviet army broke the F-FDF line. March 11, the Soviet occupation of Vyborg. The Finnish government is trying to ask for help from Britain and France, but Germany does not want Britain and France to intervene in Sri Lanka