Indonesia has deployed fighter jets and warships to patrol islands near the disputed South China Sea, the military said Wednesday, escalating tensions with Beijing after a diplomatic spat over “trespassing” Chinese vessels. President Joko Widodo also headed Wednesday to the fishing-rich waters around the Natuna Islands, which border the South China Sea, most of which is claimed by China despite competing claims from other Southeast Asian nations including Vietnam, the Philippines, and Malaysia. The Indonesian military said it had deployed eight warships and four jet fighters ahead of Widodo’s visit in an apparent bid to assert its sovereignty over the