Two drones struck near the US Embassy in Riyadh, prompting President Donald Trump to vow retaliation, saying "you'll find out soon" what form that would take. Bloomberg's Stuart Livingstone-Wallace shares what we know on Horizons Middle East and Africa. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news &

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