 Complete the following phrase:  China sent its vice premier, Geng Biao, to Thailand to negotiate the shipment of arms to the Khmer Rouge through Thailand. China also sent diplomats to stay with the Khmer Rouge encampments near the Thai border. Pol Pot met with these diplomats twice before the Chinese government withdrew them for their safety in March. In China, the Khmer Rouge set up their Voice of Democratic Kampuchea radio station, which remained their main outlet for communicating with the world. In February, the 