As U.S.-Iran tensions climb and talk of a potential strike refuses to fade, the UAE and Saudi Arabia are already behaving as if an oil supply disruption is a matter of when, not if. If they move more crude now, there is a chance there will be calm markets later. Abu Dhabi is set to export additional volumes of its flagship Murban crude in April, trade sources told Reuters on Friday. ADNOC has reportedly offered extra barrels to partners in its onshore concession, where companies including BP, TotalEnergies, CNPC, Inpex, Zhenhua Oil, and GS Energy…