The spiritual leader of Iran, Ayatollah Ali Khamenei, has warned the United States to stay out of his country's nuclear programme. Speaking on a tour of south-east Iran, Ayatollah Khamenei said the US was arrogant, rude and deserved a punch in the mouth. He also said Iran's presidential elections in June would not make any difference to its nuclear policy. The US has expressed fears Iran is trying to build nuclear weapons. Enrichment warningAyatollah Khamenei said it was not up to the US to decide which countries needed nuclear technology. He also warned that Iran's forthcoming presidential elections were nothing...