Same action of the chinese that often occurs where quite near Vietnam's shore. China bases on a vague map "nine dotted line" drawn in 1947 by Chiang Kai Shek to claim most of SCS, blatantly infringing on the waters of ASEAN countries around SCS. They are very greedy.
Good memory and nice photo! Still remember what viets were doing then? Japs starved over two millions of viets to death between 1943-1945, as Uncle Hu later claimed. Perhaps most skinny viets were serving their French rulers and earning refills to their little stomach...