Preface: Welcome Spotlight on the Yellow Sea Gray Zone / Admiral Scott H. Swift, U.S. Navy (Ret.), The Swift Group; former Commander, U.S. Pacific Fleet -- Introduction: Understanding Chinese and North Korean Gray Zone Operations in the Yellow Sea / Andrew S. Erickson, U.S. Naval War College and Harvard University -- Conceptualizing China's Maritime Gray Zone Operations / Peter A. Dutton, U.S. Naval War College and MIT -- Gray Zone Incidents in the Yellow Sea / Gregory B. Poling, Center for Strategic and International Studies -- China's Coast Guard: Organization, Forces, and Yellow Sea Applications / Andrew S. Erickson, U.S. Naval War College and Harvard University -- China's Maritime Militia in the Bohai Gulf and Yellow Sea / Conor M. Kennedy, U.S. Naval War College -- Casting a Wider Net: The Activities and Evolution of China's Maritime Militia in the Yellow Sea / Devin Thorne, Threat Intelligence Analyst, Recorded Future -- North Korea: Gray Zone Actions in the Yellow Sea / Terence Roehrig, U.S. Naval War College and Columbia.