Leaders from 17 countries gathered in Indonesia's capital yesterday to witness the inauguration of Mr Joko Widodo for his second and final term as President of Indonesia.
Among them were Prime Minister Lee Hsien Loong, Malaysian Prime Minister Mahathir Mohamad and Brunei's Sultan Hassanal Bolkiah.
Dignitaries from other Asean countries were also present, as were representatives from farther afield.
These included Australian Prime Minister Scott Morrison, Chinese Vice-President Wang Qishan and United States Secretary of Transportation Elaine Chao.
The leaders began arriving at Jakarta's Parliament building yesterday afternoon in sleek black Mercedes-Benz cars, with the swearing-in ceremony starting at around 3.30pm.
Also in attendance were former presidents Megawati Soekarnoputri and Susilo Bambang Yudhoyono, as well as Mr Joko's electoral rival, former army general Prabowo Subianto.
During the ceremony, President Joko and Vice-President Ma'ruf Amin recited the oath of office with copies of the Quran held over their heads, in front of lawmakers and regional senators that make up the People's Consultative Assembly.
Both men then signed the minutes of the president's inauguration, before President Joko spoke on the challenges for Indonesians in the future. Following the formal proceedings, visiting dignitaries went up on stage to offer the newly sworn-in leaders their well wishes.
Mr Joko, better known as Jokowi, and Mr Ma'ruf won the April election with 55.5 per cent of the vote.
In a Facebook post last night, PM Lee congratulated Mr Joko and Mr Ma'ruf and expressed his hope that bilateral ties will continue to flourish.
"As close neighbours with longstanding ties and as founding members of Asean, our two countries have been through much together," he said.
"Over the years, we have deepened our engagement and today, we collaborate across the board in trade and investment, digital economy, defence and security, education, cultural and people-to-people links."
Education Minister Ong Ye Kung, who was also at the inauguration, echoed PM Lee's sentiments in a separate Facebook post. "I wish Bapak President and his new administration all the best in ushering (in) progress for Indonesia, and even stronger relations between Singapore and Indonesia," he wrote.
Mr Lee was among several leaders who called on Mr Joko at Istana Merdeka yesterday morning, before the formal swearing-in ceremony.
In a statement, Singapore's Ministry of Foreign Affairs said PM Lee congratulated Mr Joko on his inauguration and said he looked forward to building on the existing excellent cooperation between the two countries. The leaders also agreed to continue expanding collaboration across many sectors, including in human resource development and the digital economy.