The 1MDB has turned to the Malaysian civil court to compel Petrosaudi International Ltd's (PSI) chief investment officer Patrick Andrew March Mahony (Patrick Mahony) and a United Kingdom-based law firm to return US$1.83 billion of its funds invested in a 2009 joint venture.

The Malaysian sovereign wealth fund filed the writ of summons at the Kuala Lumpur High Court on May 7, naming the British national and White & Case LLP as the first and second defendants.

According to the lawsuit's statement of claim...