 The Chinese Premier Zhou Enlai warned Étienne Manac'h, the French ambassador, that the Americans' disregard of Sihanouk, and their continued bombing in support of Lon Nol's troops, would result in a far more violent end to the war.Despite these warnings the US continued to ignore Sihanouk, and the Chinese - with some reluctance - gradually began to transfer their direct support to the Khmer Rouge alone.By the time of the Khmer Rouge's entry into Phnom Penh on 17 April 1975, the communists were firmly in control of the GRUNK, and communications between GRUNK members inside and outside of Cambodia were effectively cut off.