 It was in this short conference that Sukarno, flanked by Hatta, shook hands with Ibrahim Yaacob and said, 'Let us form one single Motherland for all the sons of Indonesia'.However, on 15 August 1945 Emperor Hirohito declared the surrender of Japanese Empire through radio broadcast.Promptly, Sukarno and Hatta proclaimed Indonesian Republic independence on 17 August 1945.