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Take this with a grain of salt as it is what I understand but I might be wrong about it.

1. Yes. In general steamdb is more accurate than third party sellers.
2. Not sure about Russia in that case, no price doesn't always mean that a key won't activate there, but I guess it's safer to lock them out just in case. It's really up to how the publisher sets it up. But I'd assume that Ukraine and Chine should be safe since there's no mention of them and the game is available there.
3. Yes, or at least that's also how I always understood it.

To add to the general confusion of region locks I've even seen specific keys that were pretty much world-wide at one point get later restricted in more countries. I remember a year or two ago buying multiple keys for one game from the same place over the course of a few months and the first two had no restrictions whatsoever but the later two had some countries excluded and steamdb confirmed this, as far as I could tell all the keys came from the same batch since I don't think many people were buying that one so I have no clue of why the restrictions changed.

Not sure if this helps you, but I wanted to try answering.

give the key to your Ukraine/Russia/ China friend who already has this game, so that he can check it for you OR set the RegLock to "no one can enter from anywhere"

2) If there is no price tag for a country, it only means you can't buy the game from steam store if you are from that region. If you want to know whether the key version of it is region-locked, you should check in the metadata section of the said package.

3) Cross-region trading and gifting only applies to gifting through steam or the redeemable region of the gift item. It means nothing to a key.

Actually we can't really sure which key is provided based on information of steamdb, especially for a game that is not bundled before. There is always a possibility that the package is not yet indexed on steamdb.

3) If cross-region trading and gifting are disabled, then the key can still be worldwide, but games can't be gifted directly through Steam between different Steam-regions

This is a more or less deprecated tag, because it's about inventory gifting.
For direct gifting upon purchase are important: 10% rule and store sub not being blocked in recipient's store region.

🤔Is there no earth government?🌏　🔭🌕🛸😊
I guess we all get in trouble every time we stumble upon a regional restriction.😅

Thank You info😊

^^

The "cross-region trading and gifting" part only relates to inventory gifts and thus is basically deprecated, since gifting games via inventory doesn't really exist anymore apart from really old leftovers in some people's inventories.

Bump!

So to make things even more cumbersome, I think you may need to check the app ID as well. I gave someone this sub, which metadata looks fine. But once you pop into the app ID metadata, you can see restricted countries = DE. I assume this specific issue is down to the recent Germany age rating thing and won't be a problem for games that people would actually want to giveaway (as they would have set it) but may also happen to other apps for other countries? But the user got the error "This item is currently unavailable in your region" when attempting to redeem even though the specific sub is clean.