The US Central Intelligence Agency(CIA) prepares to supply representatives of the so - called " moderate opposition " in Syrian rebels with more lethal weapons should the fledgling cessation of hostilities collapse, US media reported, citing officials. The Plan B will come into force should the truce collapse and negotiations lead nowhere was reportedly relayed by CIA Director John Brennan and State Secretary John Kerry in private meetings with Russian counterparts. The CIA and its regional partners are considering various types of anti-aircraft weapons for deliveries to what they call "Syrian rebels", although US and Mideast officials declined to specify the precise systems, citing the program's sensitivity and concerns with Syrian government backers' possible countermeasures. The Plan A cessation of hostilities between Syrian government forces and armed groups, with the exception of terrorist networks operating in the country, took effect on February 27 and has been described as largely holding despite violations. Moscow recorded breaching of the ceasefire hundreds of times by Al-Nusra Front terrorists and other armed groups, classified by Washington as "moderate," following takfiri attacks against Syrian army posts in southern countryside of Aleppo.