In a ceremony where a choir and musicians performed a specially written nuclear symphony, Iran recently unveiled its homemade nuclear technology, including a new centrifuge - five times faster than the current model. Iran insists it's all for peaceful purposes, but it could also take the country closer to making a bomb.
Celebrating Iran's nuclear program in such an elaborate way is of course a public spectacle for Iranians, but it's also a deliberately provocative message to the world, which President Mahmoud Ahmadinejad made crystal clear with words aimed squarely at the U.S., reports CBS News Correspondent Elizabeth Palmer.
"Anyone who thinks they can threaten Iranian resolve to carry on with our nuclear program," Ahmadinejad said, "is greatly mistaken."
But he knows a big new threat is looming.
The U.S. has marshaled unprecedented support at the U.N. Security Council for punishing new sanctions against Iran. Mr. Obama knows he can now count on Russia's backing, and for the first time the world's other superpower - China - looks as if it's on board too.
The formula for sanctions will be hard to get right. No one wants to hurt Iran's struggling opposition movement, but they do want to cripple the elite Revolutionary Guard's military and nuclear ambitions.
In public, Iran hasn't changed its tune on an aggressive nuclear program one bit, but the U.S. and its allies are hoping that behind the scenes its leaders will be having second thoughts.