Gray Zone Operations

Gray-zone operations are coercive state activities that stay below the threshold of open armed conflict, using ambiguity to gain advantage while avoiding a clear casus belli. At sea they include maritime-militia swarming, coast-guard ramming and water-cannon use, AIS spoofing, sand-dredging on disputed features, and harassment of fishing and survey vessels, tactics documented in the South China Sea. The term gained currency in US defense literature from around 2015. For shipping, gray-zone pressure raises navigational and war-risk uncertainty in contested waters without the formal trigger that a declared war provides.