Vanuatu is reviewing its controversial passport sales scheme after it strained relationships with other countries.
Foreign Minister Ralph Regenvanu told the Financial Times that the review, which will be completed by March, would look at strengthening due diligence.
Currently, the citizenship programme allows foreign nationals to obtain a Vanuatu passport for $US150,000.
The passport sales earn Vanuatu millions of dollars each year but have been criticised by some leaders, including the president.