Last week, Indonesia's government approved an offshore gas project with a price tag of over $3 billion. On the surface, that's just business as usual. Below the surface, the move is a direct challenge to China's territorial claims because the gas block is in the South China Sea. The Tuna block, Reuters reported last week, lies in the waters between Indonesia and Vietnam. The Indonesian oil and gas regulator, SKK Migas, says the block could see peak production of 115 million cubic feet daily by 2027. The gas will be exported to Vietnam, per an earlier…