Russia's Radiological Chemical and Biological Defence troops will be subject to an assets freeze and travel ban.

The Paris appeals court says Syria's president can be prosecuted over a deadly 2013 chemical attack.

The state department says Moscow has used a World War One-era weapon to "dislodge" Ukrainian troops.

Russian anti-corruption campaigner Alexei Navalny was the main opposition threat to the Kremlin.

The nerve agents adviser says questions remain about the policy of vetting speakers' social media.

A nerve agent specialist says he was cut from a conference because of his political opinions on other issues.

A study finds military veterans tested in the 1960s were more likely to experience an earlier death.

The OPCW says at least one Syrian helicopter dropped toxic chlorine gas cylinders on civilian areas.