Syria unlikely to intervene militarily in Lebanon despite US pressure

In recent weeks, US President Donald Trump has repeatedly raised the idea of Syrian intervention to disarm Hezbollah in Lebanon, apparently aiming to use it as another pressure point against Iran. However, Damascus has stronger reasons to reject military action than to consider it, as sending troops across the border could strengthen Hezbollah politically, destabilize both countries, and expose Syria to Iranian retaliation reaching its capital.

So far, no clear and comprehensive American vision has been declared regarding what is expected from Damascus. At its most limited, intervention could mean tightening border control, curbing arms and fighter smuggling, and sharing intelligence with the Lebanese army. A more dangerous scenario would involve Syrian forces entering Lebanon to take part in disarming Hezbollah or taking control of its areas in southern Lebanon.

Trump’s repeated mentions appear closer to political pressure than to announcing an imminent military operation. Raising the prospect of a Syrian role confuses Hezbollah’s and Iran’s calculations, demonstrates the multiplicity of American options, and increases pressure on the Lebanese government to prove its ability to place all weapons under state control.

But what may look like a low-cost option for the US or Israel is entirely different for Syria, which would bear the cost of human losses and security repercussions, in addition to the risk of returning to regional conflict at a time when its new leadership is betting on stability, economic recovery, and attracting investment.

Syria does possess some capacity to act, with a long border with Lebanon and factions now part of the new Syrian army that previously fought Hezbollah and know some of its methods and deployment areas. Yet this is not sufficient to wage a broad operation, as the Syrian army is still unifying factions and organizing command, armament, and deployment. The state faces internal security and economic challenges, and opening an external front risks draining key resources needed for developing state institutions and services.

The Syrian armed forces could carry out limited border operations, close smuggling routes and tunnels, and prevent armed groups from infiltrating. But they would face difficulty holding areas inside Lebanon or managing a war of attrition in populated environments. Entering Lebanon may be easier than defining the conditions for leaving it, especially if withdrawal becomes linked to a political settlement which Damascus cannot alone secure.

Nor is there any guarantee that confrontation would remain inside Lebanese territory. To retaliate, Iran could manage conflict through allied groups in Iraq, targeting Syrian military sites with drones and missiles, or carrying out security operations. The possibility of direct Iranian bombardment cannot be ruled out; the Iranian attack on US forces near al-Tanf in July demonstrated that Iran’s use of force inside Syrian territory is no longer just theoretical.

Whether conflict is managed through Iran’s allies or becomes declared confrontation with missile and drone attacks on military facilities or even Damascus, Syria would again appear to investors as an arena of regional conflict. This would directly undermine President Ahmed al-Sharaa’s top priorities: maintaining stability, attracting Gulf and Western capital, reintegrating the Syrian economy into the international financial system, and turning sanctions relief into recovery and reconstruction.

Beyond the economy, Syria would risk undoing much work in building a new unified armed force. Military failures in Lebanon could strengthen factional loyalties and give field commanders influence independent of central leadership.

There is also the problem of legitimacy. Many Syrians’ hostility towards Hezbollah for supporting Bashar al-Assad’s regime does not mean they would accept fighting a war inside Lebanon serving American or Israeli objectives. If Syrian forces appear to fight on behalf of foreign powers, the leadership could lose domestic and regional legitimacy that would be difficult to restore.

Without an official request from the Lebanese government, Syrian intervention would be considered a violation of sovereignty, evoking memories of the Syrian military occupation from 1976 to 2005. This could shift the conflict’s nature, moving the debate from Hezbollah’s armament to the presence of Syrian troops, likely strengthening Hezbollah by joining broader political forces rejecting perceived sovereignty violations.

Israel’s continuing occupation of Lebanese territory would further complicate disarmament efforts. Attempting disarmament before Israeli withdrawal would make the process appear imposed in Israel’s interest, weakening the Lebanese government’s ability to promote it among parts of the Shia community.

If fighting extends to the Bekaa, southern suburbs of Beirut, or the south, it could become broader internal conflict, especially if Hezbollah’s social base sees the objective as threatening its political position. This would result in new waves of displacement and deeper economic collapse, with possible expanded Iranian and Israeli intervention. A destabilized Lebanon would inevitably destabilize Syria.

Therefore, direct Syrian military intervention remains unlikely. The situation could change with an official Lebanese request and broad regional understanding providing political, legal, and military cover. A more realistic option is an operation inside Syrian territory, controlling the border with Lebanon, closing smuggling routes and tunnels, preventing weapons and fighter movement, and exchanging information with the Lebanese army.

That option is less risky and more sustainable, limiting Hezbollah’s logistical depth without granting it legitimacy of resisting foreign intervention, while preserving Lebanese sovereignty and institutional responsibility in addressing disarmament. Ultimately, however much pressure the US exerts, the prospect of starting a new war before recovering from the previous one is enough for Damascus to stand its ground.