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 Chinese attacked northern Vietnam, hoping to draw Vietnamese troops away from the invasion of Cambodia. As well as China, the Khmer Rouge also received the support of the United States and most other non-Marxist southeast Asian countries who feared Vietnamese aggression as a tool of Soviet influence in the region.