[3] In 2012, His Majesty The Sultan of Brunei attended the 21st ASEAN Summit which been held in Phnom Penh while Prime Minister Hun Sen attended the Royal Wedding of the daughter of Bolkiah, HRH Princess Hajah Hafizah Sururul Bolkiah in the same year.

[3] A declaration was made at the conclusion of Sultan of Brunei's one-day official visit to Prime Minister Hun Sen and King Norodom Sihamoni's Cambodia as the two nations celebrated this year's 30th anniversary of the start of diplomatic ties,[4] with both countries on 14 November 2022 vowed to reinforce their bilateral relations and cooperation for mutual benefits, according to a joint statement.

On 24 July 2014, Deputy Prime Minister Sok An greeted Pengiran Kasmirhan, the recently appointed ambassador.

[11] Both countries have decided to investigate the potential of establishing an arrangement wherein Cambodia sells agricultural products to Brunei and Brunei providing Cambodia with high-quality reasonably priced fertilizers on 29 December, Minister Dith Tina and Ambassador Pengiran Kasmirhan met and went through the general concept of the proposal.

Even though this was planned ahead of time and was consistent with a number of visits Hun Manet has been making to other neighboring capitals, it happened at a busy time for regional security due to worries about a Chinese military facility in Cambodia and the Vietnam-China standoff in the South China Sea.