China already claiming the oil field around Brunei. Luckily Malaysia best friend with China, and China thought Brunei is part of Malaysia, then China close one eye let Malaysia & Brunei continue drill. Philippines & Vietnam both butthurt because they don't like China and cannot claim the islands (oil potential oil & gas deposits) around South China Sea, even if they want to bring it to International Court of Justice, they scare lose. Since documentations can be historically traced back to China from Cheng Ho era.

inb4, no black and white, no talk.