On 1 April 1975, Lon Nol resigned and fled the country into exile: FANK almost immediately disintegrated. While Sirik Matak, Long Boret, Lon Non and several other politicians remained in the capital in an attempt to negotiate a ceasefire, the Khmer Rouge finally entered the city on 17 April. Within a few days they had executed many representatives of the old regime, and the Khmer Republic had effectively come to an end. During its brief existence it had received almost exactly one million dollars of US military and economic aid a day.