FinansUAE-Saudi brinkmanship threatens Opec unity as oil prices soarSo sour are Saudi-Emirati relations that neither side could agree on how Monday’s private discussions concluded between Opec members and allies.Brent, the international benchmark, reached a three-year high on Tuesday as the disagreement between Saudi Arabia, Opec’s de facto leader, and the UAE, a close, previously co-operative partner, triggered a briefing war between the two camps. Pictured: Saudi Aramco's Ras Tanura oil refinery and oil terminal in Saudi Arabia.Foto: Ahmed Jadallah/Reuters/NTBSimeon Kerr (FT)Anjli Raval (FT)Derek Brower (FT)