TEHRAN — Tehran's delay in responding to Israel's October missile strike on Iranian military facilities has sparked a heated debate among analysts, loyalists and critics. While the Iranian leadership has assured that retaliation under the code name Operation True Promise 3 is "inevitable," two months later tangible action has yet to be taken. 

As the days go by, the question is more pressing against the backdrop of escalating regional instability and Israel's relentless campaign to target Iranian proxies across the Middle East. Despite Iran's rhetoric of defiance, several factors, ranging from military setbacks to shifting political dynamics, have tempered Tehran's willingness — or capability — to exact revenge.

The Assad factor and the weakened 'Axis' 

The fall of Syrian President Bashar al-Assad, one of Iran's closest regional allies and a key component of the "Axis of Resistance" against Israel, has dealt a pointed blow to the Islamic Republic's regional posture and strategy. Assad's collapse, preceded by weeks of Israeli attacks that decimated Iran's most powerful proxy, Hezbollah, has left Iran more exposed and less able to fight off the sworn enemy.