The entire finland thing-
The only reason why finnish army wasn't leveled in the first week was the supreme retardation of overall commanders of stavka in 1939, supported by even greater retardation of stalin. Initial plans assumed a pincer movement north of Lake Ladoga to encircle the mannerheim line and head for helsinki, with vyborg front being pinned down by a general offensive. But because they were retards and killed all their skilled generals and officers, soviets decided instead that a frontal assault would be an excellent idea, so they pulled 2/3rds of troops from the northern border, instead focusing them on the karelian isthmus, which went wonderfully, as we all know. Even despite initial successes, fins were pushed back daily, and the entire operation ended when they ran out of ammo and found out that ethernal anglo isn't your friend and will not help you in any way, especially with the norway campaign on the horizon. Imo the entirety of finland should have been annexed, would have spared them the northern front and siege of leningrad, but it's stavka we're talking about.
In the modern day, fins stating that they have a remote chance against russians is like skinny kid trying to start shit with a trained mma fighter. You might get a single surprise punch, after which you'll end with a pretty high dental services invoice. Their professional force is less than five thousand, which is about 10% of how many professional troops russia has in northern military district alone.