US president may have upstaged the ghost of Soviet leader Khrushchev by musing destruction of fellow member stateDonald Trump has a habit of discomfiting delegates to the United Nations general assembly. But this year, he may have upstaged the ghost of Nikita Khrushchev by openly contemplating the annihilation of a fellow UN member state.Eleven minutes into a 40-minute address, the US president announced he had “a big decision to make” over Iran, which has staged a much more determined resis