Subscriber OnlyMarketsEconomicsRussia to Leapfrog Saudi in Wealth League as Oil Power ShiftsSaudi Arabia central bank reserves decline as Russia’s growRussia has saved despite oil’s drop while kingdom spent cashPhotographer: Andrey Rudakov/BloombergByNatasha Doff+FollowAugust 11, 2019, 3:00 AM UTCUpdated onAugust 12, 2019, 7:47 AM UTCTerms of Trade is a daily newsletter that untangles a world embroiled in trade wars. Sign up here. The shifting balance of power in the oil world is showing up in a new indicator: central bank reserves.