According to historians Jowett & Snodgrass, Mcateer, Lunde, and Alanen & Moisala, the Battle of Tali-Ihantala, along with other Finnish victories (Battle of Viborg Bay, Battle of Vuosalmi, Battle of Nietjärvi, and Battle of Ilomantsi) achieved during the period, finally convinced the Soviet leadership that conquering Finland was proving difficult, and not worth the cost;[16][30][1][2] the battle was possibly the single most important battle fought in the Continuation War, as it largely determined the final outcome of the war, allowing Finland to conclude the war with relatively favorable terms[16][31] and continue its existence as an autonomous, democratic and independent nation.[16][32] Finnish researchers state that Soviet sources – like POW interviews – prove that the Soviets intended on advancing all the way to Helsinki.[33] There also existed an order from Stavka to advance far beyond the borders of 1940.[17]
http://en.wikipedia.org/wiki/Battle_of_Tali-Ihantala
Not even close to unconditional surrender. Finns has fought against Russians many times and know well that it would be better to die than to be conquered by Russians :-D