His comments come as the war heads into winter amid uncertainty over what the colder climate will mean for hostilities.
NATO chief Jens Stoltenberg warned Tuesday that Russia was using winter as a "weapon of war" following strikes against Ukrainian infrastructure which he expected Russia would step up because it is actually failing on the battlefield.".
Moscow's invasion of Ukraine has had a particular impact on Finland, which shares an 830-mile long border with Russia and was once part of the Russian empire.
In 1939, the Soviet Union invaded the country sparking what is known asthe Winter War.
Concerned about the threat posed by Russia, Finland announced in May it would seek to join NATO, ending decades of neutrality.
Katie Laatikainen, a political science professor at New York's Adelphi University, said that despite Russian threats, Finland has been among the most steadfast supporters of Ukraine in the war.
Also, the year of Finland's independence from Russia has been corrected to 1917. »
