If the evolving diplomatic battle over the disputed South China Sea has a front line, it could be the island of Ly Son.
Here, some 30 kilometres off Vietnam's central coast, Vietnamese fishermen are vowing to continue working deep in the Paracel Islands.
That is despite crackdowns and seasonal fishing bans by China, which occupies and claims the entire archipelago.
It is a vow echoed by Vietnamese officials, who have formally complained about the detention and ill-treatment of hundreds of fishermen in recent years as part of Beijing's assertions of sovereignty.
This is even as they try to negotiate, against the odds, a settlement to their long dispute with Beijing.
Both countries hold claims to the islands based on ancient history. But China, as occupier, is holding all the cards.
And the Paracels are proving an early sticking point in talks between Beijing and Hanoi as they map out a framework to guide a broader settlement of various maritime problems.