Use a firewall if you have root access UFW, iptables.
https://ipinfo.io/countries/cn <good start
You could block them at the server level but using a firewall that reject the request and does not respond ( play dead in the water) is best -- you just ain't there (stealth mode).
VISA and Mastercard do not have any member banks in China
https://www.ft.com/content/a67350fa-...4-ab04428977f9
Quote:
Excluding its business in China, UnionPay claims just 0.5 per cent of the global market, compared with Visa?s 50 per cent and MasterCard?s 31 per cent.
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Union Pay will not do porn -- Porn is illegal in China.
I don't know about the export laws/rules to China if you have some mainstream product or service that the Chinese buyer would want.