I'm interested to know what territorial claims Russia would have on Finland.
As far as I am aware, it is the other way round and Finland could arguably have territorial claims against Russia.
Several parts of Finland were ceded to the Russians at the Moscow peace treaty in 1940 (which ended the Winter War 1939 - 40) and Finns would argue that they wanted those parts back.
I think after WW2 there may have been more territory ceded to Russia but am not certain.
From time to time various groups call for the parts of Karelia which were ceded to be returned.
The general consensus, and the government line, is that this is not going to happen.
One of the things which always amuses me, is that Russians who want to travel from, say, St. Petersburg to Murmansk find it easier to use Finnish roads - roads in Finland go south to north whereas in Russia they radiate from Moscow - making that journey difficult within Russia.