There is a certain user who is suspended on this site and on the English site. They have also caused trouble and have a record of poor answers and vote counts on other sites. This person seems to have a need to cause trouble and can't behave themselves even though they've already been suspended on one site.
Although they have avoided trouble on the main SO site, a look at recent answers is not promising.
I propose that anyone who has been sufficiently misbehaving on 2 sites really needs a time out across the whole network. I know the suspensions are not coordinated currently, but I think this needs to be implemented.