US president warns of a 'severe' Western response if Moscow deploys these weapons, cautions against Russian false flag operations

Alliance's chief says Moscow would have 'a high price to pay' if it uses chemical weapons, refuses to 'speculate about any any military response from the NATO side'

NATO chief Jens Stoltenberg warns that Russia 'could plan chemical weapons operations' after spreading baseless accusations that Ukraine is developing biological warfare

Envoys say Damascus continues to carry out chemical attacks that constitute 'crimes against humanity,' still hiding significant quantities of chemical warfare agents and munitions

Unidentified detainee, who lives abroad, suspected of aiding crimes against humanity committed by Assad regime during civil war

Mother of journalist Farzad Bazoft says documents relating to UK connections to so-called supergun were stolen from him days before he traveled to Baghdad

Syrian representatives suspended from voting in annual meeting of Organization for the Prohibition of Chemical Weapons or from holding any position in global body

Probe by global watchdog concludes Assad's air force used the chlorine in strike on town of Saraqib; Syria continues to deny use of chemical weapons

Russia accuses organization of 'political crusade' against its close ally during clash at UN Security Council meeting

Moscow urged by Western nations to 'transparently' reveal circumstances of opposition figure poisoning; Damascus faces calls for investigation over chemical weapon attacks