On Saturday, Saudi Arabia shut down a key oil pipeline after an unmanned aerial strike fired from Iraq. The shutdown cuts oil flow.
Iraq opened an investigation into the strikes and closed three frontier posts with Iran.
Yemen retaliated against Houthis. Saudi Arabia has few options as it confronts mounting threats from Iran and its supporters. The attack from Iraq caused the pipeline shutdown. Iraq's probe over the attacks continues. The closed frontier posts with Iran form part of Iraq's response.