Singapore and Thailand authorities are collaborating on an investigation into Cambodia's Prince Group, which has been targeted by the U.S. for alleged transnational fraud. The group's chairman faces sanctions from the U.S. and the UK for fraud and money laundering. The investigation may lead to individuals and entities involved being added to the U.S. sanctions list or facing legal action. The group is accused of using cryptocurrencies and online financial platforms for illegal fund transfers and fraudulent activities.