The new constitution came into force on 24 September 1993, and Sihanouk was reinstated as the King of Cambodia. A permanent coalition government was formed between FUNCINPEC, CPP and a third political party, the Buddhist Liberal Democratic Party (BLDP). In turn, Sihanouk made Ranariddh and Hun Sen First and Second Prime Ministers, respectively. Shortly after that, Sihanouk left for Beijing, where he spent several months for cancer treatment. In April 1994, Sihanouk returned and the following month called the government to hold new elections so that the Khmer Rouge could be co-opted into the government. Both Ranariddh and Hun Sen rejected his suggestion, but Sihanouk pressed on, and further proposed a national unity government consisting of FUNCINPEC, CPP, and the Khmer Rouge headed by him. Again, both prime ministers rejected Sihanouk's proposal, arguing that Khmer Rouge's past intransigent attitude made the proposal unrealistic. Sihanouk backed down, and expressed frustration that Hun Sen and Ranariddh had been ignoring him. As both Norodom Sirivudh and Julio Jeldres, his younger half-brother and official biographer, respectively, saw it, this was a clear sign that the monarchy's ability to exert control over national affairs had diminished, at least vis-a-vis the prime ministers.