where can i sell a cd key fast?

You can try to return the key to the web sute you bye it.

Bought in the Russian store for the account itself, or wha?

your account was locked coz you purchased with vpn from russian store, just activation is fine and don't speak otherwaise without facts since ioni know for sure steam won't lock due to vpn activation

I highly doubt it'd be allowed as a new user, since it'll likely be automatically flagged as a high-risk item. Even though G2A claims the status can be revoked if the key proven legitimate, it's just rhetoric, and their copy pasta support team will just tell you to sell items at that are of lower risk of being fraud and to "learn the ropes" first. It's in their best interests, but really, it's just an aggravatingly misleading system.

After transaction you have to wait 14 days to use money , after that you can either use it as G2A wallet or you can transfer money to paypal,skrill etc but fees do apply after transfer 1$ + depends on amount transfering.

May I ask when that happened?

Agreed.. I was in Dubai for work last week, but when I purchased a few games it was all in my local currency as if I was in South Africa. So region you're in does not affect the store front for pricing, etc.