HANOI: Chinese defence firms will participate in an arms fair in Vietnam next month, a Vietnamese defence official said on Friday (Nov 15), a possible sign of deepening military ties between the two neighbours. Vietnam will hold an international defence exposition in Hanoi from Dec 19 to Dec 22, two years after it organised its first-ever military fair. The Southeast Asian nation seeks to boost domestic production as well as diversify their sources of military hardware, which have been heavily