In Kalimantan, the Japanese also killed many Malay intellectuals, executing all the Malay Sultans of West Kalimantan in the Pontianak incidents, together with Chinese people who were already against the Japanese for suspecting them to be threats. Sultan Muhammad Ibrahim Shafi ud-din II of Sambas was executed in 1944. The Sultanate was thereafter suspended and replaced by a Japanese council. The Japanese also set-up "Pusat Tenaga Rakjat" (PUTERA) in the Indonesian archipelago in 1943, although it was abolished the following year when it became too nationalistic. Some of the Indonesian nationalist like Sukarno and Hatta who had returned from Dutch exile began to co-operate with the Japanese. Shortly after his release, Sukarno became President of the Central Advisory Council, an advisory council for south Borneo, Celebes, and Lesser Sunda, set up in February 1945.