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L'AQUILA, Italy (CNN) – U.S. President Barack Obama argued Friday that the G8 had sent a clear message to Iran: The world will not "wait indefinitely" and allow you to build nuclear weapons.

"The international community has said, 'Here's a door you can walk through that allows you to lessen tensions and more fully join the international community,'" Obama told reporters at a news conference.

"If Iran chooses not to walk through that door, then you have on record the G8 to begin with, but I think potentially a lot of other countries, that are going to say, 'We need to take further steps.'"

CNN Radio: Ed Henry reports from the G-8

Obama - who has promised diplomatic engagement with Tehran - said offering a "door" has always been "our premise."

"But we also say we're not going to just wait indefinitely and allow for the development of the nuclear weapon, the breach of international treaties, and wake up one day and find ourselves in a much worse situation and unable to act. So my hope is that the Iranian leadership will look at the statement coming out of the G8 and recognize that world opinion is clear."

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L'AQUILA, Italy (CNN) – President Obama said Friday that leaders of the industrialized nations have agreed to continue fueling economic growth while strengthening regulatory measures but they also realize that full recovery is "still a ways off."

Obama listed some of the achievements of the Group of Eight summit this week in Italy as the conference neared the end, and he stressed the need for collective action.

In addition, the G8 nations agreed to stop the spread of nuclear weapons, set goals for reducing carbon monoxide emissions and invest $20 billion in food security. That money is in addition to humanitarian aid already provided.

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