This was a unique case, non US citizen defendant and a home country that was willing to prosecute one of their own citizens for an overseas crime.
The U.S. does this to a very limited extent, IIRC, if an American citizen travels overseas to have sex with a child prostitute, they can be prosecuted in the U.S.
In my opinion, this should be a very rare occurrence (1) where the evidence is clear and umambigious, and (2) where the crime is of a universal nature; murder of an innocent, child sex related, etc...
I tend to agree. China’s leadership isn’t exactly something I’d bank on though. We’ll see how it plays out over the years.