I'm pretty sure Vanuatu goverment will revoke your citizenship in case of serious criminal charges from your home country (murder, drugs, extortion, serious fraud, etc). The decision will be motivated by national security risk or something like that. Then you will be milked by local lawyers to fight against it in order not to be deported to your home country. It it very likely when all your money is gone on lawyers you will loose the battle in court and will be︀ deported to serve a sentense.