Claims that Assad is using chemical weapons are like a barometer: when the Syrian army is doing well, they surface, notably in 2013, 2015 and now, just as the Syria government looks close to some kind of 'victory'. Both times in the past the intelligence came from Mossad and the claims fizzled out, though the propaganda that it was 'likely' by the Syrian Army stuck in western perception. The current chemical 'attack', instantly hailed by Israel, occurred just as peace talks were beginning in Geneva. The source of the claim is, again, most likely Israel, though that's not part of the media fireworks. Tillerson might have checked with the Russians, as Russian military were stationed at the airport.
That is the background to the bombing of the air base April 6, in retaliation for a suspected chemical weapons attack on civilians in rebel-held Idlib province two days before. National security adviser General Herbert McMaster solemnly declared, "We could trace this murderous attack back to that facility." Secretary of State Rex Tillerson accused Russia of being either complicit or incompetent in failing to keep its 2013 promise of completely destroying Syria's chemical weapons supply.
Kremlin spokesman Dmitry Peskov called it "an act of aggression against a sovereign country violating the norms of international law, and under a trumped-up pretext at that. Washington's move substantially impairs Russian-US relations, which are in a deplorable state as it is." Russia said it had suspended deconfliction channels with Washington, set up to avoid air collisions over Syria, though the Pentagon said it continued to use the channel.
Why would Assad launch chemical weapons when he was winning? The most plausible explanation was that the Syria air force hit a supply depot in rebel-held territory. That Assad would have ordered the use of chemical weapons was dismissed by Russian deputy UN ambassador, Vladimir Safronkov, who vetoed the usual US-sponsored Security Council resolution condemning Assad, suggesting it was altnews. "We have not yet any official or reliable confirmation" of what took place or who was responsible, said the UN special envoy for Syria, Staffan de Mistura, at a press conference after the incident. The EU echoed this, though European countries either supported the US strike or kept mum.
Safronkov warned the US, "If military action occurred, it will be on shoulders of those who initiated such doubtful and tragic enterprise. Look at Iraq, look at Libya." Olof Skoog, Sweden's ambassador to the United Nations, sounded a similar note. "I remember Hans Blix. Of course I'm concerned" about the possibility of a US attack in Syria." Bolivia, a current member of the Security Council, requested an emergency session to address, and perhaps condemn, the US missile attack in Syria.
What makes the accusation doubly doubtful is the fact that Syria joined the international chemical weapons treaty in 2013, agreeing to renounce all use of chemical weapons, and through the mediation of Russia, to dispose of all that were in their hands. The deadline for destruction was 2014. Syria gave the Organisation for the Prohibition of Chemical Weapons an inventory of its chemical weapons arsenal and started its destruction in October 2013, 2 weeks before its formal entry into force. Idlib, the site of the current 'attack', has moved back and force, and has been in rebel hands since 2015, and all the weapons were not yet removed.
As if scripted, ISIS stormed the Syrian army checkpoints in the nearby strategic town of Al-Furqalas.