US Secretary of State John Kerry called on Thursday for Syrian and Arab ground troops to take on ISIL militants to enable what he named "a complete defeat of the organization.

US Secretary of State John Kerry called on Thursday for Syrian and Arab ground troops to take on militants of the so-called 'Islamic State of Iraq and the Levant' (ISIL) takfiri group to enable what he named "a complete defeat of the organization."

"I think we know it, that without the ability to find some ground forces that are prepared to take on ISIL, this will not be won completely from the air," Kerry told delegates a gathering of dozens of foreign ministers in Belgrade.

When asked later whether he was referring to Western or Syrian ground forces, he said: "Syrian and Arab, as we have been consistently". Washington is however due to send 50 US special forces into Syria soon.

His comments at the annual ministerial council of the Organization for Security and Cooperation in Europe (OSCE) came after Britain's parliament voted late on Wednesday to join the US-led bombing campaign over Syria.

The last round of Syria peace talks were held in Vienna last month, bringing together 17 countries including Russia, the United States, Saudi Arabia and Iran.

The talks set a fixed calendar for a ceasefire followed by a transitional government in six months and elections one year later, but Syrian opposition figures have called this unrealistic.

"If we get the political transition in place we empower every nation and every entity to come together, the Syrian army together with the opposition... together with Russia, the United States and others to go and fight (against) ISIL," Kerry said in Belgrade.

"Just imagine how quickly this scourge could be eliminated in a matter of literally months if we were able to secure that kind of political resolution."

In Brussels on Wednesday, Kerry had urged NATO allies to intensify the fight against the ISIL takfiri group.

Syria has been hit by a violent unrest since mid-March 2011, where the Syrian government, as well as western media reports, accuse countries, mainly the USA, Turkey, Saudi Arabia and Qatar of orchestrating the conflict and providing terrorist groups with money, weapons and trained mercenaries.

In May 2011, Syrian army launched a wide-scale operation against armed groups and gunmen operating in the country, who started to escape the army blows and infiltrate illegally to Lebanon.