Rebels in Indonesia’s restive easternmost region of Papua on Thursday shot dead an American pilot and set a civilian plane on fire in what a spokesperson for a local separatist group described as a “message” to the US and Indonesian governments. A low-level battle for independence from Indonesia has long raged in the resource-rich western half of Papua, where attacks by independence fighters have grown deadlier and more frequent as they have procured better weaponry. Sebby Sambom, a...