WASHINGTON — With the release of America's National Intelligence Estimate, according to which Iran has suspended its nuclear weapons program, the prospect of military confrontation with the Bush administration dimmed. But months later, it is clear that the danger is not past, because Iran has not renounced the production of nuclear weapons, which its enriched uranium could eventually be used to fuel.

All parties need to find a formula to resolve the issue before it again threatens to erupt into conflict. Western diplomacy in recent years has focused on Iranian President Mahmoud Ahmadinejad as the key to resolving the crisis.

But this approach is a blind alley. Let us recall the fate of Ahmadinejad's two immediate predecessors. Muhammad Khatami (1997-2005) tried to implement dramatic political reform, while Akbar Hashemi Rafsanjani (1989-97) tried to open the Iranian economy to the West. Both failed, because Iran's presidents do not run the country. A solution to the nuclear dilemma — or any other problem in Iran's foreign relations — is in the hands of Supreme Leader Ayatollah Ali Khamenei.