Thornberry opposed Britain's involvement in the Saudi Arabian-led intervention in Yemen against the Shia Houthis. She said that "while Saudi Arabia will remain a valued strategic, security and economic ally in the years to come, our support for their forces in Yemen must be suspended until the alleged violations of international humanitarian law in that conflict have been fully and independently investigated." In May 2018 Thornberry said support in Syria for the country's president, Bashar al-Assad, had been "underestimated" in the West. In October 2018 Thornberry criticised Theresa May's government's response to Jamal Khashoggi's disappearance as "too little, too late". She said: "Imagine how this government would have reacted if either Russia or Iran had abducted–and in all likelihood murdered–one of their dissident journalists within the sovereign territory of another country."