Ironically, even though it has gone down as a Finn-Russian conflict, in sentiment, there barely were any Russian soldiers in that war, just some poor sods conscripted from the southern regions in USSR (like Ukraine for example), ill-equipped for winter conditions. And Stalin, of course, was a Georgian. For example the infamous battle of Raate Road (in which a whole Soviet division was wiped out) was
against a Ukrainian division.
These men had been promised an easy war of "liberation" which would basically just consist of them walking into Helsinki to be hailed as liberators, while getting to loot the country-side.
The real big conflict between Finland and Russians happened at the end stage of WW2.
That was when Stalin actually invested significant resources behind the attack. That was the Red Army at its height, the same army with many of the same officers that beat back the Germans and the Japanese, so reaching a military stalemate with USSR at that time, is what I consider to be Finland's greatest military achievement.
Anyway, speaking of Finns and Muslims, there was actually one historical battle between Muslims and Finns, during Russia's liberation of Bulgaria.
https://en.wikipedia.org/wiki/Finnish_Guards'_Rifle_Battalion#Russo-Turkish_War_1877–78
https://en.wikipedia.org/wiki/Battle_of_Gorni_Dubnik