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From the Aussie Telegraph, it would appear that someone, or some people, have identified JV.
But just what is a "worldwide ban" and how would it be enforced in, say, the US? Or China?.......Kenya.....or any other place?
Just as in the same way as any other case of contempt of court would be approached. 'Agents' do not chase them round the world. However, attempts will be made to identify them and Facebook is not as anonymous as those who use it would like to think it is.
Having been identified, a warrant will be issued and the first time they enter the jurisdiction of the court (i.e. the UK it's dependencies or territories) that are vulnerable to being detained and delivered to the court concerned which will then deal with them.
They will never know whether or not a warrant has been issued in their name and so their only safe strategy would be to stay out of the jurisdiction of the court for ever. Quite a sacrifice in many cases.
I don't believe extradition treaties can usually be used to effect the capture of warrant dodgers. What do you think would happen to Assagne is he set foot outside the Ecuadorean Embassy? Would he be allowed to go on his way? Hardly!
He has some answering to do to the court that bailed him!