"your citizens" includes your ISPs so you can forbid them from delivering that content to their customers in your country, which is just site blocking. The law could allow consumption of the material but not redistribution within your country so it's not the end user's responsibility but is the ISP's.

What about name suppression for criminal cases? If somebody is charged with a crime but hasn't yet had their trial, or is the victim of a crime such as sexual abuse, some countries will allow judges to forbid publication of their name (in case they turn out to be innocent) so local media can't say who it is but foreign media does and local people all know who it is anyway, defeating the purpose of name suppression. Perhaps we shouldn't have name suppression?