Yes I can. A "modern military" isn't a guaranteed victory if your enemy is fighting in it's own turf in difficult terrain. The best armies in the world have failed to do this in Afghanistan (several times now).
Stalin also gutted the Soviet Army and Navy via The Purges before the Winter War, and the Army had attempted to impliment a lot of "New Soviet Man" style of changes that were detrimental.
The modern Russian army has experience in several different theaters, has experienced and professional leadership, and rocks a small but highly modernized kit backed by copious amounts of older Soviet-era gear.
The Ukranians just got slammed with huge cruse missile attacks -- how will the Fins neutralize that with conscripts carrying skis and rifles?
I respect their bravery, but boldness doesn't stop JDAMs -- they need NATO.
https://puolustusvoimat.fi/en/finnish-conscription-system
Therefore I do not think Finland would be a walk-over for the Russians...not to mention what happened last time Russia fought Finland:
https://en.wikipedia.org/wiki/Winter_War