The claim that Singapore refused to sell oil to Cambodia and told Hun Sen to leave is not supported by evidence. Recent reports indicate Cambodia halted fuel imports from Thailand due to a border dispute, not Singapore. Singapore continues to export oil to Cambodia, with no reported refusal. Diplomatic ties between Singapore and Cambodia remain positive, as shown by recent high-level communications. The claim likely stems from confusion with the Thailand-Cambodia issue. No credible sources confirm Singapore expelling Hun Sen or halting oil sales.