Any nation facing the Russians and are facing great odds usually look at two modern wars - the Polish-Soviet War of 1918-1921 and the Winter War of 1939 when plucky Finland held their own against the Soviet Union.
Are there things Ukraine can learn from the Winter War? Over at USNIBlog, I think there is ... but it isn't tactical.
Come on by and give it a read.
UPDATE: Linked fixed.
Thanks for fixing the link. Nice heroic war story, but I have to say it is pretty bold suggesting Finland as any sort of a model both in terms of its territorial loss from that war (which at 11% is just about spot-on the proportion of a pre-2014 Ukraine less Crimea and the Donbas), as well as the subsequent experience of Finlandization, which would seem to suit the Kremlin just fine as a solution with Ukraine.
Worth noting however, I completely agree with your highlighting the importance of a strong civil society/social cohesion in resisting. Unfortunately, developing a Nordic/Scandi level of cohesion in Ukraine is probably not in the cards in the remotely foreseeable future.
Noticed same issue of neither link working earlier. Wondering if the USNI link embargoed for publishing later today, or something.