>How come Italy can dictate what foreign vessels (Banksys ship is registered in German as per the article) do in international waters?
IIRC they can't have a say on what they do in international waters. They can however have a say on a German ship bringing migrants into an Italian port. It's up to the Italian authorities to accept or deny the German vessel at that point.
Unless Banksy or the German Gov. provides a shuttle transport from Italy to Germany, then that's like me going around the neighborhood rescuing stray dogs and cats and dumping them on a neighbor's yard because he's closer to where I found them. It then becomes less "me rescuing them" and more "me making it someone else's problem".
IIRC they can't have a say on what they do in international waters. They can however have a say on a German ship bringing migrants into an Italian port. It's up to the Italian authorities to accept or deny the German vessel at that point.
Unless Banksy or the German Gov. provides a shuttle transport from Italy to Germany, then that's like me going around the neighborhood rescuing stray dogs and cats and dumping them on a neighbor's yard because he's closer to where I found them. It then becomes less "me rescuing them" and more "me making it someone else's problem".