<sod >Donald Trump's ambition of securing a peace deal with North Korea - something that none of his predecessors were able to do - has apparently been placed on the back burner, after he announced he was cancelling a planned summit in Singapore with the Kim Jong-un.< eod>< sod > He called it a "missed opportunity" and "truly sad moment in history." It had been Mr Trump'sÂ ambition of securing a peace deal with North Korea - something that none of his predecessors were able to do - has now apparently been placed on the back burner.< eod>