US diplomats urge for strikes against Assad

Dozens of US state department officials have signed an internal memo protesting against US policy in Syria and calling for targeted military strikes against president Bashar al-Assad's government.

They argue the current approach is working against the Syrian opposition and helping Assad to stay in power.

It was signed by 51 mid-to-high level officials who advise on Syria issues. According to the BBC, it is rare to have this number of diplomats voice opposition to a White House position.

An official familiar with the letter told media that it was sent "because the status quo is not sustainable".

The document reportedly urges a credible threat of military action against the Assad government. Otherwise, it says, Damascus will feel no pressure to negotiate with the rebels.

This reflects concerns that the collapse of a joint US-Russian peace process is benefitting the regime. The ceasefire has been violations by both the opposition and the government but Assad has openly defied the truce, and his forces, backed militarily by Iran and Russia, seem intent on regaining strategic territory such as the crucial city of Aleppo.

Moscow argues that it is supporting strikes against jihadist insurgents not covered by the ceasefire.

But secretary of state John Kerry, who has pushed opposition groups to lay down their arms, is growing increasingly frustrated as the Syrian regime continues to change facts on the ground while he calls for diplomacy.

"The United States is not going to sit there and be used as an instrument that permits a so-called ceasefire to be in place while one principal party is trying to take advantage of it to the detriment of the entire process," he said recently.

Kerry has pressed the administration for tougher action against the regime in order to force it to the negotiating table, the BBC reports. However, it is unlikely to sway the Obama administration, which has prioritised the fight against Daesh in Syria and largely stayed clear of the civil war.

However, president Obama's possible successor, presumptive democratic presidential candidate Hillary Clinton, has argued for a more assertive policy in Syria, including stronger support for non-Islamist rebels.