So I think it's important to balance their characterisation in a way in which they are distinctive characters with interesting personalities and backstories but also acknowledges the challenges they face without making their entire character essentially "They're sad all the time because of Russia" or "Stop talking about their struggles under Russia I don't like politics."
I think both are problematic however I find the latter to be far more distasteful because well. This is a nation personification OC we're talking about and not only that, they're essentially nations within a nation (Russia) by virtue of colonisation and so are minority groups within the larger nation. Hell - because of displacement and immigration from European Russia , a lot of these groups are minorities within their own lands. It's a special case when dealing with minority groups/occupied people personifications and it's particularly egregious when someone wants to forgo any kind of acknowledgement of these power imbalances yet still insists that their interpretation is sensitive.
I've seen some pretty bad OCs of Siberian groups which are the product of the creator going "I hate politics stop talking about politics!" or, an almost direct quote, "I hate when people shove politics into historical hetalia." Which... Is an interesting take to say the least considering how history feeds into politics and vice versa. Historical hetalia is a beast in an of itself and is one of the only hetalia communities/bubbles in which "no politics" will get you laughed out the door from what I've seen considering *gestures to my previous statement*. If you've ever taken a history course - you'll know how much history and politics are intertwined.
This is how you get interps which consists of the likes of "Russia was wandering around the empty lands of Siberia" which not only blatantly disregards the brutality of the Russian colonisation of Siberia but also promotes the concept of "Terra Nullius" or "Virgin Land". I'm quoting myself from an even bigger post I have in store which focuses on anti Mongolian sentiment however stereotypes about Mongolians and Siberian groups often overlap because of their placement in Northern Asia, hence why it applies to both,
"In addition, to hone in on Mongolia being an "untouched, pristine" land - this is also a common trope that is launched towards traditionally nomadic "unsettled groups” (such as Siberian and Native American groups). The concept of "Terra Nullius", a Latin word meaning "nobody's land". It completely disregards the presence and rights of the people who inhabit the land and has been historically used to justify the colonisation and displacement of such groups - their land belonged to "nobody" so it was essentially up for grabs...It divorces the people from their landscape and paves the way for dangerous misconceptions and justifications to blossom.
Here is an example of "Terra Nullius" in action in a Russian propaganda poster, encouraging Russians to move to Kazakhstan."
Or interps such as "[Siberian group] has forgiven Russia for everything he did/most things he did and is in love with him" which implies that the mistreatment of the Siberian groups is merely something in the past when it is in fact ongoing. The mistreatment of Siberian groups such as the Sakha, Buryats, Chukchi and Tuvans has been all the more highlighted in their disproportionate mobilisation in the invasion of Ukraine - and the heaps of scapegoating that was subsequently shovelled onto them.
That's not to say ethnic minority soldiers in the Russian army shouldn't be held accountable for their crimes - however that and the fact that they themselves are victims of Russian imperialism can both exist as true statements. The scapegoating is so bad that even Pope Francis joined in, blaming the brunt of the war crimes committed onto "Non Russians" such as Buryats and Chechens, as they do not come from "Russian culture."
Back to my main point... I think the resistance to do research on and publicly acknowledge how these groups live under Russia and what kind of struggles they face in some kind of bid to "not paint them as victims!!11" is sorely misinformed and ignorant. Because well. They are victims.
Not in the sense that you should portray them as sad, pitiful, weak little meow meows but in the sense that yes they are living under Russian occupation and are an occupied people who's been subjected to centuries of Russification, and so compared to making an OC of Mongolia who is an independent nation state at least I think there is far less room to be hauling around "leave politics out of historical hetalia!" "don't talk to me about politics!" "stop victimising them!!" because then it leads to tone deaf interpretations such as "They've forgiven Russia for everything and is in love with him ♥️💖", "Russia is actually [Siberia groups] father", "Here is my singular Siberia OC who represents ALL Siberian groups and by the way Russia is their father" (yes these are all real interpretations I've seen and I've made a separate really strongly worded post ranting about it) and worse. I mean I've literally seen an "aph Siberia oc" who was Russia and France's love child. Terra Nullius executed Hetalia-style.
I don't really think I need to elaborate on why a singular Siberia OC is problematic - Siberia is filled with a myriad of different groups who speak different languages, have different origins and ways of lives and practices, different religions, who've experienced eras of peace and conflict with each other, etc and yeah to shove them all into one personification is an erasure of the sheer diversity that is in Siberia. I definitely don't need to elaborate on why making Russia a father to any of these groups is problematic, to say very the least.
On the point of "don't only portray them in a victimising lense", I think making Siberian groups all depressed all the time is also a Russia-centric perspective. Of course it's ignorant at best to not acknowledge their shared suffering because of Russia however when this point and this point alone is central to their character I believe in a way that it strips them of their autonomy and ability to feel things and do things outside of Russia's gaze. There is absolutely a lot of joy to be had despite their current situation, perhaps even in spite of their current situation. It's ok to give them odd quirks and put them in funny situations as well as acknowledge that they are an occupied people and approach that territory carefully when need be.
For example, I made my Buryatia bubbly and loud but made my Tuva a bit more deadpan because I see them as a pair who often associate with each other and I think the dynamic is funny. I also made Buryatia an overbearing "husband" to Soyot who is perpetually tired™ from all the se- .
I made a crack dynamic between Sakha, Evenkia and Dolgan where Evenkia was Sakha's teacher at first but then became a deadbeat dad leaving Sakha to primarily raise Dolgan, thus Dolgan takes after Sakha and is uh lawyermaxxing👍. Yukaghir is the little old lady of the group who is often forgetful but very nifty and Chukotka acts like a big sister to people which Koryak (who I see as her brother) always finds annoying and they often bicker. Ket is on the slightly edgy side and is extremely particular about his routines and Nganasan terrifies Nenet because he eats reindeer whereas Nenet doesn't.
All of these quirks/ more lighthearted interpretations and "they are an occupied people under Russia" can coexist. One should not be thrown out for the sake of the other.
I think there's also problem - though I've seen this far less, in making Siberia ocs purely as a middle finger at Russia. As in, you made the OC because you wanted to say loud and proud FUCK RUSSIA which well yeah, fuck Russia, but I highly doubt your interest in this group lies outside of wanting to #own the Russians which is dehumanising in and of itself. At least pretend to care about the history and culture instead of using an entire group of people to make a virtue-signally oc purely to try and upset some Russians.