ASEAN Defence Ministers pose for a photo before their meeting retreat in Hanoi, Vietnam, February 19, 2020. From L-R: Malaysia's Haji Mohamad Bin Sabu, Myanmar's General Sein Win, Philippines Vice Minister Cardozo Luna , Singapore's Ng Eng Hen, Thailand's Vice Minister General Chaichan Changmongkol, Vietnam's Ngo Xuan Lich, Brunei's 2nd Minister Awang Halbi bin Mohd Yussof , Cambodia's General Tea Banh, Indonesian Ministry of Defence?s Secretary General Vice Admiral Agus Setiadji, Laos Minister Chansamone Chanyalath and ASEAN Secretary-General Lim Jock Hoi. REUTERS/Kham

Britain's Prime Minister Boris Johnson and Brunei's Sultan Hassanal Bolkiah wave their hands, as they meet at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah for a meeting at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah for a meeting at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah for a meeting at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah for a meeting at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson goes out to welcome the Sultan of Brunei, Hassanal Bolkiah (not pictured), at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson receives the Sultan of Brunei, Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Britain's Prime Minister Boris Johnson goes out to welcome the Sultan of Brunei, Hassanal Bolkiah (not pictured), at Downing Street in London, Britain, February 4, 2020. Stefan Rousseau/Pool via REUTERS

Brunei's Sultan Hassanal Bolkiah waves as he leaves after meeting Britain's Prime Minister Boris Johnson, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Brunei's Sultan Hassanal Bolkiah waves as he leaves after meeting Britain's Prime Minister Boris Johnson, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson goes out to welcome the Sultan of Brunei, Hassanal Bolkiah (not pictured), at Downing Street in London, Britain, February 4, 2020. REUTERS/Antonio Bronic

Brunei's Sultan Hassanal Bolkiah waves as he arrives at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson and Brunei's Sultan Hassanal Bolkiah wave their hands, as they meet at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson shakes hands with Brunei's Sultan Hassanal Bolkiah, at Downing Street in London, Britain, February 4, 2020. REUTERS/Peter Nicholls

Britain's Prime Minister Boris Johnson welcomes the Sultan of Brunei, Hassanal Bolkiah, at Downing Street in London, Britain February 4, 2020. REUTERS/Antonio Bronic

Southeast Asian Games - Opening Ceremony - Philippine Arena, Bocaue, Philippines - November 30, 2019 Brunei Darussalam athletes during the opening ceremony REUTERS/Eloisa Lopez

Southeast Asian Games - Opening Ceremony - Philippine Arena, Bocaue, Philippines - November 30, 2019 Philippines President Rodrigo Duterte and the Sultan of Brunei Haji Hassanal Bolkiah during the opening ceremony REUTERS/Eloisa Lopez

Brunei's Sultan Hassanal Bolkiah (2nd L) holds talks with South Korean President Moon Jae-in (2nd R) during their summit meeting at the Presidential Blue House in Seoul, South Korea, November 24, 2019. Kim Hee-Chul/Pool via REUTERS

South Korea's President Moon Jae-in (R) shakes hands with Brunei's Sultan Hassanal Bolkiah (L) prior their summit meeting at the Presidential Blue House in Seoul, South Korea, November 24, 2019. Kim Hee-Chul/Pool via REUTERS

South Korean President Moon Jae-in (R) shakes hands with Brunei's Sultan Hassanal Bolkiah prior their summit meeting at the Presidential Blue House in Seoul, South Korea, November 24, 2019. Kim Hee-Chul/Pool via REUTERS

Brunei's Sultan Hassanal Bolkiah (L) speaks with South Korean President Moon Jae-in (not pictured) their summit meeting at the Presidential Blue House in Seoul, South Korea, November 24, 2019. Kim Hee-Chul/Pool via REUTERS

Thai Prime Minister Prayuth Chan-Ocha, Vietnam's Prime Minister Nguyen Xuan Phuc and Brunei's Sultan Hassanal Bolkiah shake hands at ASEAN-Japan Summit in Bangkok, Thailand, November 4, 2019. REUTERS/Soe Zeya Tun

Thai Prime Minister Prayuth Chan-Ocha, Vietnam's Prime Minister Nguyen Xuan Phuc, Australia's Prime Minister Scott Morrison and Brunei's Sultan Hassanal Bolkiah attend the East Asia Summit (EAS) in Bangkok, Thailand, November 4, 2019. REUTERS/Athit Perawongmetha

Malaysian Prime MInister Mahathir Mohamad, Chinese Premier Li Keqiang, Thai Prime Minister Prayuth Chan-Ocha, Vietnam's Prime Minister Nguyen Xuan Phuc, Australia's Prime Minister Scott Morrison, Brunei's Sultan Hassanal Bolkiah, and Cambodia's Prime Minister Hun Sen shake hands at the East Asia Summit (EAS) in Bangkok, Thailand, November 4, 2019. REUTERS/Athit Perawongmetha

New Zealand's Prime Minister Ms. Jacinda Ardern, Myanmar's State Counsellor Aung San Suu Kyi, Chinese Premier Li Keqiang, Thai Prime Minister Prayuth Chan-Ocha, Vietnam's Prime Minister Nguyen Xuan Phuc, Australia's Prime Minister Scott Morrison, Brunei's Sultan Hassanal Bolkiah, and Cambodia's Prime Minister Hun Sen attend the East Asia Summit (EAS) in Bangkok, Thailand, November 4, 2019. REUTERS/Athit Perawongmetha

Malaysia's Prime Minister Mahathir Mohamad and Brunei's Sultan Hassanal Bolkiah attend a special lunch on sustainable development on the sidelines of the ASEAN summit in Bangkok, Thailand, November 4, 2019. REUTERS/Soe Zeya Tun

Brunei's Sultan Hassanal Bolkiah attends the ASEAN-China Summit with Chinese Premier Li Keqiang on the sidelines of the 35th ASEAN Summit in Bangkok, Thailand November 3, 2019. REUTERS/Soe Zeya Tun

President of the Philippines Rodrigo Duterte, Thailand's Prime Minister Prayuth Chan-ocha, Vietnam's Nguyen Xuan Phuc, Brunei's Sultan Hassanal Bolkiah and Cambodia's Prime Minister Hun Sen after the Opening Ceremony of the 35th ASEAN Summit in Bangkok, Thailand November 3, 2019. REUTERS/Athit Perawongmetha

Brunei's Sultan Hassanal Bolkiah attends the Opening Ceremony of the 35th ASEAN Summit in Bangkok, Thailand November 3, 2019. REUTERS/Athit Perawongmetha

Brunei's Sultan Hassanal Bolkiah greets journalists after attending the inauguration of Indonesia's President Joko Widodo for the second term, at the House of Representatives in Jakarta, Indonesia, October 20, 2019. REUTERS/Willy Kurniawan

Brunei's Sultan Hassanal Bolkiah greets Indonesian parliament members during the Indonesian presidential inauguration for the second term, at the House of Representatives building in Jakarta, Indonesia, October 20, 2019. Adi Weda/Pool via REUTERS

Brunei's Sultan Hassanal Bolkiah waves to journalists as he arrives to attend the inauguration of Indonesia's President Joko Widodo for the second term, at the House of Representatives in Jakarta, Indonesia October 20, 2019. REUTERS/Willy Kurniawan

BruneiÕs Sultan Hassanal Bolkiah sign a guest book as Indonesian President Joko Widodo and Indonesian First Lady Iriana Widodo stand at the Presidential Palace in Jakarta, Indonesia, October 20, 2019. REUTERS/Willy Kurniawan

Indonesian president Joko Widodo gestures as he welcomes BruneiÕs Sultan Hassanal Bolkiah during a meeting at the Presidential Palace in Jakarta, Indonesia, October 20, 2019. REUTERS/Willy Kurniawan

Brunei’s Sultan Hassanal Bolkiah and Indonesian president Joko Widodo walk during a meeting at the Presidential Palace in Jakarta, Indonesia, October 20, 2019. REUTERS/Willy Kurniawan

Brunei's Second Minister of Foreign Affairs Erywan Pehin Yusof addresses the 74th session of the United Nations General Assembly at U.N. headquarters in New York City, New York, U.S., September 30, 2019. REUTERS/Brendan McDermid

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes pose with medals REUTERS/Dylan Martinez

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes pose with medals REUTERS/Dylan Martinez

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes on the podium REUTERS/Dylan Martinez

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Silver medalist Brunei's Rose Chelimo on the podium REUTERS/Dylan Martinez

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes on the podium REUTERS/Ahmed Jadallah

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes on the podium REUTERS/Ahmed Jadallah

Athletics - World Athletics Championships - Doha 2019 - Women's Marathon - Khalifa International Stadium, Doha, Qatar - September 28, 2019 Gold medalist Kenya's Ruth Chepngetich, silver medalist Brunei's Rose Chelimo and bronze medalist Namibia's Helalia Johannes on the podium REUTERS/Ahmed Jadallah

Chinese Foreign Minister Wang Yi speaks to Brunei’s Princess Masna (not pictured) during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Brunei's Princess Masna speaks to Chinese Foreign Minister Wang Yi (not pictured) during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Chinese Foreign Minister Wang Yi shakes hands with Brunei’s Princess Masna during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Chinese Foreign Minister Wang Yi speaks to Brunei's Princess Masna (not pictured) during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Chinese Foreign Minister Wang Yi speaks to Brunei’s Princess Masna during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Chinese Foreign Minister Wang Yi shakes hands with Brunei’s Princess Masna during the meeting in Zhongnanhai in Beijing, China September 5, 2019. Andrea Verdelli/Pool via REUTERS

Sultan of Brunei Hassanal Bolkiah, Malaysia's Prime Minister Mahathir Mohamad and his wife Siti Hasmah, and Indonesia's President Joko Widodo and his wife Iriana watch a display of military weaponry at the 54th National Day Parade in Singapore August 9, 2019. REUTERS/Edgar Su

Sultan of Brunei Hassanal Bolkiah arrives to take his seat next to Malaysia's Prime Minister Mahathir Mohamad and his wife Siti Hasmah at the 54th National Day Parade in Singapore August 9, 2019. REUTERS/Edgar Su

Sultan of Brunei Hassanal Bolkiah (C), Malaysia's Prime Minister Mahathir Mohamad (R) and his wife Siti Hasmah, Indonesia's President Joko Widodo and his wife Iriana arrive for the 54th National Day Parade in Singapore August 9, 2019. REUTERS/Edgar Su