Saudi denial of oil tankers entering a Yemeni port brought the Yemeni conflict to the fore in the oil sector. While the oil implications are negligible, the movement of the conflict towards the sea raises the potential for an accidental incident leading to direct conflict between the Saudi coalition and Iran, and the U.S.
The Syrian ceasefire agreed by Russia and the U.S. could lead to a stabilization of some portions of Syria and reduce the chances of direct clashes between Russian and American aircraft, but it does not appear that enough of the important factions are currently satisfied with their positions to lay the groundwork for a larger, negotiated settlement.
This is more than a diplomatic row among GCC members. Perhaps emboldened by President Trump’s visit, Saudi Arabia and its allies have declared if you are with Iran (or specific radical Sunni groups), you are against us. This effort to delineate sides in the region cannot be easily reversed without substantial outside pressure. Expect a geopolitical premium to creep into energy prices as this dispute continues.