Last week, Cambodia’s deputy military chief, the eldest son of Prime Minister Hun Sen, paid an introductory visit to Brunei since assuming his position. While the trip itself was part of a series of prescheduled introductory visits to neighboring states, it nonetheless spotlighted some of the ongoing activity on the defense aspect of the relationship between the two Southeast Asian countries.
Brunei and Cambodia, which established diplomatic relations in 1992, also have a defense component to their wider ties as well. Defense ties include basic components such as visits, exchanges, and training offered by Brunei to Cambodia, as well as wider multilateral security interactions including through ASEAN-led mechanisms which both countries participate in.
In full: https://thediplomat.com/2019/07/cambodia-brunei-military-ties-in-the-headlines-with-hun-manet-introductory-visit/