 Both Germany and Sweden were keen to see an end to the Winter War . The Germans feared losing iron ore fields in northern Sweden and threatened to attack at once if the Swedes granted the Allied forces right of passage . The Germans even had a theoretical invasion plan called the Studie Nord against Scandinavian countries , which later became the full @-@ blown Operation Weserübung . As the Finnish Cabinet hesitated in the face of the harsh Soviet conditions , Sweden 's King Gustav V made a public statement on 19 February in which he confirmed having declined Finnish pleas for support from Swedish troops . On 25 February , the Soviet peace terms were spelled out in detail . On 29 February , the Finnish government accepted the Soviet terms in principle and was willing to enter into negotiations . 
