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Siti Hasmah Mohd Ali, wife of Malaysian PM Mahathir Mohamad, walks with Ho Ching, wife of Singapore's PM Lee Hsien Loong, at the Perdana Leadership Foundation in Putrajaya, Malaysia

Siti Hasmah Mohd Ali, wife of Malaysian Prime Minister Mahathir Mohamad (front centre R), walks with Ho Ching, wife of Singapore's Prime Minister Lee Hsien Loong (front L), at the Perdana Leadership Foundation in Putrajaya, Malaysia 19 May 2018. Ariffin Jamar/The Straits Times via REUTERS ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. NO RESALES. NO ARCHIVES. SINGAPORE OUT.

PM Lee in Indonesia

Prime Minister Lee Hsien Loong meets Indonesian president Susilo Bambang Yudhoyono