I do not understand why the name of the suspect was announced so quickly before an official request was submitted to the State of Vietnam for his extradition or trial.
So that the manhunt can begin with the help of the public. They probably weren't able to locate him so far. You can't extradite or try someone you have not arrested yet.
And if an indictment file was prepared before the site was shut down, why was the suspect not arrested before his name was announced?
They announced his name because they need your help to locate him