Chief of staff of the so-called Free Syrian Army (FSA), Brigadier General Salim Idris, said on Thursday that the consignment will help armed groups men in their battles against the Syrian Army.

The general, however, said the weapons lack the required capability to overpower tanks and planes in the strategic town of al-Qusayr, which is situated about 35 kilometers (22 miles) south of the western city of Homs.

Idris further said the FSA will not attend the upcoming Geneva conference on Syria unless the United States and its allies provide the rebels and mercenaries in Syria with anti-tank and anti-aircraft missiles.

He acknowledged that foreign-backed terrorists are weak on the ground, saying it would not be fruitful for them to step into peace negotiations with the Damascus government at the moment.

On May 7, Russia and the United States agreed in Moscow to hold an international conference on Syria, which will serve as a follow-up to an earlier Geneva meeting held in June 2012. The new event is reportedly expected to take place in early June this year.

Idris had previously called on Washington to deliver 700 tons of arms to the rebels every week over the next month.

Turmoil has gripped Syria since March 2011, and many people, including large numbers of Syrian security forces, have been killed in the unrest.

The Syrian government maintains that the chaos in the country is being orchestrated from outside and there are reports that a very large number of terrorists are foreign nationals.