On 23 March 1948, after the signing of the Renville Agreement, the Dutch released Ratulangi and his colleagues. They were transferred to Surabaya and then escorted to the demarcation line near Mojokerto and Jombang where they made their way to the capitol of the republic in Yogyakarta. They were greeted warmly on their arrival in Yogyakarta and a reception was held by Sukarno with many Indonesian leaders in attendance. Ratulangi was appointed special adviser to the Indonesian government and a member of the Indonesian delegation in negotiations with the Dutch. He also visited troops in East Java and attended a financial conference in Kaliurang. Around this time, his was having issues with his health.