 Soenario had a key role in the formation of the Non-Aligned Movement and was an essential participant in the Asian-African Conference in 1955.On 23 April 1955, Soenario and Zhou Enlai, premier of the People's Republic of China, signed a treaty ending the dual nationality of the Chinese living in Indonesia.Under the treaty, citizens of Chinese origin would have to choose within two years whether they have Chinese or Indonesian nationality.