In November 1962, Sihanouk called on the US to stop supporting the Khmer Serei, which he believed they had been secretly doing through the CIA. He threatened to reject all economic aid from the US if they failed to respond to his demands, a threat he later carried out on 19 November 1963. At the same time, Sihanouk also nationalised the country's entrepot trade, banking sector, and distillery industries. To oversee policy and regulatory matters on the country's entrepot trade, he set up the National Export-Import Corporation and Statutory Board, better known as "SONEXIM". When Sarit, Diem, and US president John F. Kennedy died in November and December 1963, Sihanouk rejoiced over their deaths, as he accused them of attempting to destabilise Cambodia. He organised concerts and granted civil servants extra leave time to celebrate the occasion. When the US government protested Sihanouk's celebrations, he responded by recalling the Cambodian ambassador to the US, Nong Kimny.