MOSCOW, Oct 25 (Reuters) - Russian sovereign wealth fundRDIF said on Thursday that Saudi Arabia's sovereign wealth fundPublic Investment Fund (PIF) would become a new partner in thejoint Russia-China Investment Fund.

As part of the agreement, Saudi's PIF will contribute $500million to the investment fund, raising its total capital undermanagement to $2.5 billion, Russia's RDIF added in a statement.

(Reporting by Polina Devitt; editing by Alexandra Hudson) ((Polina.Devitt@thomsonreuters.com; +7 495 775 12 42; ReutersMessaging: polina.devitt.reuters.com@reuters.net))