I'd wager they were pissed off either way, considering they kept getting beat by little Finland, the ones getting beat being the fucking beast that was the Soviet Union. When considering how powerful the Soviet Union was back then, Finland was pretty damn good to be able to hold them back for so long, in so many ways. :P
In details.
Not even joking. :P
It's a pretty cool story, though! ^^
A fucking Finnish expert sniper just literally WRECKING so many Soviet soldiers and the ones who kept sending more after him must've been SO pissed off! XD