Iran’s president delivered a bombastic anti-Western tirade at his General Assembly speech on Thursday, blaming the United States, Israel and Europe for the global recession and a litany of other ills. The speech provoked what has become a ritual large-scale walkout of delegations led by the United States.

The president, Mahmoud Ahmadinejad, said poverty, homelessness and denial of basic rights were traceable to “greed for materialism in the United States and Europe.”

The Islamic Republic has been estranged from the United States since the Islamic Revolution more than 30 years ago, and Mr. Ahmadinejad’s speech has become something of a signature event at the annual General Assembly session. There were no surprises in either his criticisms or his singular interpretation of world events.