The presidents of Syria’s two top allies met last week, and Iran’s new president, Hassan Rouhani, took the opportunity to praise Russian President Vladimir Putin’s new role on Syria.He expressed hope that Russian diplomacy will avert what he called “a new war,” an apparent reference to threatened U.S. airstrikes.Iran may have good reason to welcome any easing of tensions on Syria, according to Iran watcher Mark Fitzpatrick at London’s International Institute for Strategic Studies.“As much as Syria is a complicated problem for Western nations, it’s immensely more complicated for Iran," noted Fitzpatrick." I think that in many ways, Syria is becoming like Vietnam for Iran, a mess that they’re stuck in and they can’t get out of.”Exiled Iranian journalist Amir Taheri calls that “an exaggeration,” but said Iran has invested significant resources in Syria for what he said are ideological reasons.“The problem is Iran is a split personality," he explained."Iran as a revolution has an interest in Syria. Iran as a country doesn’t have any interest in Syria. Rouhani wants to make Iran a country again.”Western leaders hope President Rouhani will take a more constructive approach in talks on Iran’s nuclear program, and the new head of Iran’s Atomic Energy Agency has said as much.