Iran on Friday warned Israel it would retaliate to an attack with a "strong blow," after the New York Times reported that the IAF had conducted a drill, apparently for a strike against the Islamic republic. "If enemies, especially Israelis and their supporters in the United States, would want to use a language of force, they should rest assured that they will receive a strong blow in the mouth," senior cleric Ayatollah Ahmad Khatami was quoted by AFP as saying during a Friday prayers sermon, which was also broadcast live on state radio. Khatami stressed that the Iranian nation's mentality was "to fight foreigners." "Given this mentality, if you make a hostile look at the Islamic Iran, you will witness such a united roar by our nation that it will definitely make you regret any vicious move forever," he added. On Thursday, Iranian President Mahmoud Ahmadinejad said "the nuclear issue has ended from our point of view." "Recently they have started a new game - by testing us - but this will result in no achievement for them except humiliation," he said without elaborating.