Vietnam said it resolutely opposes a Chinese ban on all fishing activities in a sea area that covers the Gulf of Tonkin, claiming the act to be a “worthless decision”. The ban on all fishing activities between May 16 and August 1 violates international law and Vietnam’s sovereignty and jurisdictional rights, said a statement on the foreign ministry website late on Saturday. China’s move came as the two neighbors seek to patch up ties since a bilateral row erupted in May last year when China deployed a $1-billion oil rig in waters claimed by Vietnam.