My question is: what did you say or do to provoke this? Facebook rarely acts completely out of left field. I mean, sure, it happens, but this doesn't even sound legit to me.

Did you maybe state publicly that you think certain people should die or be killed?
Did you express really racist views on Facebook someplace public?
Did you try to stalk someone, hack them, anything like that?

See, I'm not saying you actually did any of that - or stuff I didn't mention, for that matter - but you didn't mention anything you might have done. It's just, "Hey, facebook randomly disabled my account and said it can't be reviewed", and I have trouble believing there isn't more to the story, that's all.

Nope, not buying it. Sorry. Try harder next time.
For 1 thing, facebook is a US based company. It's highly unlikely that they would just pander to the wishes of Russia / Ukraine.
For another, why on earth would those countries want random people booted off of facebook anyway? I uh, don't think you're quite important enough to warrant that, somehow.

russia interfered  in 2020 elections? hahahahaha now that  was funny

Yes actually it's been proven that Russian state sponsored hacking and propaganda groups interfered (mostly unsuccessfully) in the 2016 election and attempted to do so again in this one.
I'm guessing that what's happening here is that Facebook is taking a better safe than sorry approach to this and blocking any suspected disinformation or bot pages from that region. Something Jonixter did or said made the AI believe he was part of that network.
It could also be that entire IP ranges are being blocked to stem the flood from a specific ISP or area and he just got caught up in it.
I have other potential theories as well, but no evidence for them.

the theory of the ips being blocked maeks sence but is stupid and i thought that 2016 one was prooven but wasnt sure so now i am. nothing to say

There's not too much you can do aside from leaving Facebook behind. If you did something they didn't like or were included in a block of IP addresses where someone else did it, that's it. If you shared a post going against the current narrative that COVID is extremely dangerous, or you support Donald Trump, or did any number of other things they don't like, that's grounds for getting blocked according to them.

Those who really want to contact you will find other ways to do so. Facebook is not essential when there are literally dozens of other ways to keep in touch. They quit being a free speech platform as soon as they started becoming a publisher by arbitrarily deciding what they will and will not allow on their platform. I wonder how long it'll be until your phone company decides to disconnect calls because you're talking with someone about Trump or COVID in a manner they don't like? That's essentially what Facebook and Twitter are doing now.

@13
While they're no longer the best platforms, everyone who makes claims like yours ignores two things.  They've always been private companies, and free speech rights have never extended to private companies.  And also, every time we start in on the "they're biased in favor of the left" people look into it, do studies, etc, and fail to find evidence that there's bias going on.  If there were, you can bet congress would be waving the evidence around--but the best anyone can offer is an assurance that yes, it really happens, we swear, really, don't you believe in the invisible dragon?

U.S. telecoms companies are different legally speaking because they're categorized as something more like the mail or the electrical grid.  I think the term is neutral carrier.  But your telephone company won't be able to interfere with your phone calls unless congress first changes a lot of legislation.

@14
Everyone who tries to use a VPN for stuff seems to miss the bit about how Facebook or whoever can see that you're on a VPN.  When you use a VPN you're somewhat anonymous, but you're also waving a giant "I'm anonymous" flag for everyone to see because the VPN nodes have well-known IP addresses and share them between thousands of people each.

The same still applies to data centers. That IP has more than likely been used by hundreds, if not thousands of different users before you.

@16, Simple logic coming your way:
User logs into Facebook from VPN.
Facebook internally notes IP address in database.
Company employee happens to review this database and notices an odd IP address.
Or:
You do something to get flagged and your IP address is checked.
Facebook sees its from a VPS provider like Digital Ocean, or Vultr, or OVH.
Boom, anonymity blown.
Simple as that. IP addresses don't tend to lend themselves to hiding you very well.

Bleh, come on guys.  All of those vps IPs are in well-known datacenters with well-known IPs.  Even if you don't have a database from the IANA saying who owns the IP, a tracert or reverse DNS usually reveals it.

It is ironically easier to protect yourself from a hostile government than from Facebook when it comes to anonymity, because Facebook is the party you're communicating with.  Whoever is at the far end will always be able to tell that you're anonymous if they want, one way or another.  They can't necessarily find out who you are, except that with Facebook part of what you're doing is literally telling them exactly that, but they'll still know you're anonymous.