The team established by the global chemical weapons watchdog will investigate nine alleged attacks during the country's civil war.
North Korean leader Kim Jong-un's half brother Kim Jong-nam was a spy for American intelligence, the Wall Street Journal reported, saying he was in Malaysia to meet his CIA handler in February 2017.
The poisoning of a former Russian double agent, Sergai Skripal, in the British city of Salisbury stunned the world this year.
The three incidents in 2018 bring to 39 the number of chemical attacks documented by the team since 2013. Weaponising chlorine is prohibited under the Chemical Weapons Convention and international humanitarian law.
Initial findings by the OPCW into a suspected chemical attack in the Syrian town of Douma indicate that chlorine may have been used but that there were no indications that a nerve agent was used in the April 7 attack.
Two Britons became critically ill after an apparently chance encounter with the poison near the site of the March attack on Sergei and Yulia Skripal.
Two people died after the attacks in Syria's Hama province at the end of March 2017. Dozens of people suffered severe respiratory symptoms.
At least 20 people were killed in the attack. The chemical weapons agency has not named a perpetrator, but witnesses say the chemicals were dropped on the rebel-held area from helicopters known to belong to the Syrian regime forces.
The comments came at the Organisation for the Prohibition of Chemical Weapons meeting held at the Hague as the watchdog has started its investigation on the site of the attack in Syria's Douma.
Relations between London and Moscow have crashed to a post-Cold War low after an attack on an ex-Russian spy, the first known offensive use of a nerve agent in Europe since World War Two.
French President Emmanuel Macron says the use of chemical weapons in Syria a "red line", but notes he does not have proof they have been used by the Assad regime.
After being hit by deadly sarin gas in Idlib on April 4, Omar Hamoud, an anti-Assad rebel fighter, was brought to Turkey for medical treatment. He says the attack on Khan Shaykhun was part of a broader offensive.
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