On 21st December 2022, H.E. Datin Paduka Siti Hajjar Adnin attended the 275th Meeting of the ASEAN Committee in Ottawa (ACO) Heads of Mission chaired by H.E. PG Kamal Bashah PG Ahmad, the High Commissioner of Brunei Darussalam as the Chair of the ACO, from June-December 2022.
The High Commissioner of Brunei Darussalam also handed over the Chairmanship of ACO to H.E. Daniel T. Simanjuntak, Ambassador of the Republic of Indonesia who will be the new Chair of ACO for January to June 2023.