Supreme leader Ayatollah Ali Khamenei, seen here in January 2010, said on Feb. 8 that Iran is set to deliver a "punch" that will stun world powers during this week's 31st anniversary of the Islamic revolution. AFP

Supreme leader Ayatollah Ali Khamenei said on Monday that Iran is set to deliver a "punch" that will stun world powers during this week's 31st anniversary of the Islamic revolution.

"The Iranian nation, with its unity and God's grace, will punch the arrogance (Western powers) on the 22nd of Bahman (February 11) in a way that will leave them stunned," Khamenei, who is also Iran's commander-in-chief, told a gathering of air force personnel.

The country's top cleric was marking the occasion when Iran's air force gave its support to revolutionary leader Ayatollah Ruhollah Khomeini, a key event which led to the toppling of the US-backed shah on February 11, 1979.

His comments came as Iran said it would begin to produce higher enriched uranium from Tuesday, in defiance of Western powers trying to ensure the country's nuclear drive is peaceful.