John Key last night had a meeting with Chinese Premier Wen Jiabao, a drink with Australian Prime Minister Julia Gillard and dinner with Singapore Prime Minister Lee Hsien Loong.
He is staying in Phnom Penh for the East Asia Summit and is sharing his hotel with the Prime Minister of India, Manmohan Singh, the President of Burma, Thein Sein, and the Prime Minister of Laos, Thongsing Thammavong.
This afternoon, he meets President Barack Obama and five other leaders involved in the Trans Pacific Partnership, and all that is before the East Asia Summit actually begins.
Mr Key left his hotel for the Wen meeting at about 6pm in a motorcade - said to be a familiar sight on the city streets for local high-ranking officials.
Most streets are dotted with memorial portraits of the former King, Norodom Sihanouk, who died last month in Beijing, aged 89.