Russia has presented evidence to the UN secretary General Ban Ki-Moon on the use of chemical weapons by "the Syrian opposition" in Aleppo, Russia's permanent envoy to the UN Vitaly Churkin said.

"I have submitted to the UN chief the results of analyzing samples taken by Russian experts at the site where the shell was fallen in Khan al-Asal... I want to stress that we have got the samples directly, not through a third party," Russia Today site quoted Churkin as saying to journalists on Tuesday.

He added that the samples were analyzed in a Russian laboratory, officially approved by the Organization for Prohibiting the Chemical Weapons, and the outcome proved that on March 19th, 2013, the Syrian opposition launched non-guided shells of "Bashaer 3" on Khan al-Asal area which is controlled by the Syrian army.