Saudi Arabia’s Public Investment Fund (PIF) is to join forces with Russia"s RDIF PIF will contribute $500 million to the investment fund, raising total capital under management to $2.5 billion RIYADH: Saudi Arabia’s sovereign wealth fund Public Investment Fund (PIF) is to join forces with Russian sovereign wealth fund RDIF as a new partner in the joint Russia-China Invesment Fund, it was announced on Thursday. As part of the agreement, Saudi’s PIF will contribute $500 million to the investment fund, raising its total capital under management to $2.5 billion, Russia’s RDIF added in a statement.