Russia’s Rosneft earlier this week announced that it had started drilling a production well off the coast of Vietnam in the South China Sea. Today, two sources close to the Vietnamese unit of the Russian company told Reuters there were concerns there about China’s possible reaction to the drilling. The well is located in the Lan Do gas field, which, according to Wood Mackenzie, falls within the nine-dash line outlined by Beijing as marking the territory that it has claim over in the South China Sea. The Lan Do field holds an estimated 23 billion cubic meters of natural gas, and Rosneft also has plans to drill in another field that’s part of the same block, Phong Lan Dai, later this year. There is no sign of any concern in the company’s press release with the latest drilling update, but another oil company, Repsol, got burned not long ago […]