Pol Pot established a new headquarter along the border, near Pailin. He called on the Khmer Rouge to redouble their efforts in gaining support across Cambodia's villages. In June, Samphân announced that in contravention of earlier agreements its troops would not disarm, stating that it refused to do so while Vietnamese soldiers remained in Cambodia. The Khmer Rouge became increasingly confrontational, expanding its territory across western Cambodia. It carried out massacres of the Vietnamese settlers who had recently arrived in the area. Hun Sen's forces also carried out military activities, with UN peacekeepers proving ineffective in preventing the violence. In January 1993, Sihanouk returned to Beijing, declaring that Cambodia was unprepared for elections. The Khmer Rouge had formed a new party, the Cambodian National Union Party, through which it could take part in the election, but in March Pol Pot announced that they would boycott the vote. At this point he moved his headquarters to Phnom Chhat; Samphân joined him there, having withdrawn his Khmer Rouge delegation from Phnom Penh.