A murdered Saudi journalist, and a scrapped Iran nuclear deal. The two events alone have undone years of diplomacy in the Middle East, testing old alliances and shaking up the regional balance of power, analysts say. “The killing has sparked multiple battles that are likely to shape relationships ranging from that between the US and Saudi Arabia to those between Trump, his Republican Party, the US Congress and the country’s intelligence community,” said James Dorsey, a fellow at Singapore’s RSIS.