The fight following China's occupation of the Paracel islands is especially sensitive because the government of North Vietnam didn't counter the Chinese move, or even acknowledge force was used. At the time, Beijing was giving it arms and money to fight the United States and Vietnamese troops from the south.
Anti-China sentiment is widespread in Vietnam, and the Hanoi government is vulnerable to charges it is not tough enough against Beijing, something that pro-democracy groups are keen to exploit. Overseas Vietnamese groups and dissidents have traditionally marked the battle.
"After a long time, the deaths of my husband and others seemed to fall into oblivion, but I'm very glad that they have been mentioned," online newspaper Vietnamnet quoted Huynh Thi Sinh, the widow of the captain of the naval ship who died along with 73 others. "Maybe in his world he's feeling satisfied. His sacrifice is very meaningful. I'm proud."
The Vietnamese and Chinese navies clashed again in 1988 in the disputed Spratly Islands, killing 64 Vietnamese sailors. That clash has not been marked either.
Illustrating the difficult path the government is treading, online dissident groups announced plans to protest against China in Hanoi on Sunday. Similar demonstrations have occasionally occurred over the past few years. They are normally quickly broken up by authorities, which are highly nervous of any sign of organized public protest.
