Helicopter crash comes as Iran already faces huge challenges

A country already in political transition could soon be forced to replace more than one leader

The Iranian helicopter crash comes at a time when the country, faced by unprecedented external challenges, was already bracing itself for a change in regime with the expected demise in the next few years of its 85-year-old supreme leader, Ayatollah Ali Khamenei.

In the country's hydra-headed leadership where power is spread in often opaque ways between clerics, politicians and army, it is the supreme leader, and not the president, that is ultimately decisive.