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The Russian military says that it is very likely chlorine and white phosphorous were used against soldiers and civilians.
Islamist rebels are trying to seize areas of Aleppo under government control.
Russia will now be supplying state-of-the-art weapons to army units on its western borders.
The UNSC also condemned attacks on schools in Syria and said these could constitute war crimes.
Meanwhile, an Amnesty International report says US-led Coalition air raids have killed 300 in Syria.
A biometric employee-access system, which monitors the time of arrival and departure of staff, will be implemented.
Moscow says attacks on funerals, civilian families, hospitals and aid convoys constitute war crimes.
The Russian and Syrian air forces have unilaterally halted airstrikes on Aleppo for an 11-hour ceasefire that began on Thursday,
Talks on Sunday come after Russian President Putin endorsed Saudi plans to cut output and boost oil prices.
Both Zuma and Putin referred to the "complicated global situation" during a bilateral meeting.