I don't know of any practical way to ban ips from a state. And if someone really wants to annoy you they can use a proxy server and appear to come from somewhere else.
The global ignore thing is a good idea, if he doesn't notice it, it may keep him busy for a long time.
Other than that there's not much you can do. There's kind of a trade-off between making it easy for people to join and keeping spammers out. I guess you could moderate new users.
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