evidence: Natuna: an idyll on the front line between Indonesia and China [...] More than a thousand kilometres north of Indonesia's sprawling capital Jakarta, Natuna Besar island is just a speck in the vast South China Sea. [...] A flotilla of as many as 63 Chinese fishing boats, four Chinese coast guard vessels and a Chinese maritime surveillance vessel sailed into the Natunas, causing a tense confrontation on the water and a furious exchange between Jakarta and Beijing.