`` I think the unilateral deployment of an oil rig that 's surrounded by a security cordon including naval ships and within the envelope of air cover clearly does n't pass the 'straight face ' test on setting up arrangements of a practical nature . China sends documents to the United Nations backing claim to Paracel Islands . Vietnam also claims the region and is angry about alleged incursion into its territory . Tensions increased after China sent an oil tanker into disputed waters . Both sides have accused the other of damaging their ships .
China sends documents to the United Nations backing claim to Paracel Islands . Vietnam also claims the region and is angry about alleged incursion into its territory . Tensions increased after China sent an oil tanker into disputed waters . Both sides have accused the other of damaging their ships .