Russia is set to discuss this incident with the Turkish side, which is guarantor of the armed opposition's cessation of hostilities in the Idlib de-escalation zone. Russian military experts in chemical protection arrived in the city of Aleppo hours after militants launched a chlorine attack on residential districts of the city, the Russian Defense Ministry's spokesman, Maj. Gen. Igor Konashenkov, told reporters on Sunday. "Groups of specialists from units of nuclear, chemical and biological warfare protection deployed at observation posts in Syria urgently arrived to the area of the attack, carrying special equipment with them. They are working with the...