After Kahin was expelled from Indonesia in 1949, he helped young Indonesian diplomats Sumitro Djojohadikusumo, Soedarpo Sastrosatomo, and Soedjatmoko during their work at the United Nations and in Washington, D.C. He also developed a close relationship with Sukarno and Mohammad Hatta, the first President and Vice President of Indonesia.
Setelah Kahin diusir dari Indonesia pada tahun 1949, ia membantu diplomat muda Indonesia Sumitro Djojohadikusumo, Soedarpo Sastrosatomo, dan Soedjatmoko selama mereka bekerja di PBB dan di Washington, D.C. Ia juga menjalin hubungan dekat dengan Soekarno dan Mohammad Hatta, Presiden dan Wakil Presiden pertama Indonesia.