Brunei's Sultan Hassanal Bolkiah delivers a speech during the launch of Commemorative Notes of the 50th Anniversary of the Currency Interchangeability Agreement between Singapore and Brunei at the Istana Wednesday, July 5, 2017, in Singapore.

Brunei's Sultan Hassanal Bolkiah delivers a speech during the launch of Commemorative Notes of the 50th Anniversary of the Currency Interchangeability Agreement between Singapore and Brunei at the Istana Wednesday, July 5, 2017, in Singapore.

© 2017 AP Photo/Wong Maye-E