"We condemn all use of chemical weapons, we are in close contact with the United States, we are monitoring the situation closely. And if any use of chemical weapons is confirmed we'll respond appropriately", May told the parliament.
The US Department of State claimed earlier in the day that there were "signs" that the Syrian government might be using chemical weapons.
The rhetoric followed a statement by Head of the Russian centre for Syrian reconciliation Maj. Gen. Viktor Kupchishin, who said that terrorists operating in the Idlib de-escalation zone possess significant amounts of poisonous substances with which they fill munitions to use in staged provocations aimed at accusing the Syrian army of "chemical attacks" against civilians.
READ MORE: EU Disregards Int'l Legal Instruments, Including on Chemical Weapons — Moscow
This was not for the first time when Russia warned that terrorists operating in Syria continue to prepare chemical weapon provocations to accuse Damascus.
The US and its allies have been accusing the Syrian government of being responsible for a series of alleged chemical attacks, particularly, an incident in the city of Douma on 7 April 2018, ignoring emerging evidence that that is could have been a false-flag operation by militants.
Last year, the United States, the United Kingdom and France used the allegations, spread by the controversial White Helmets, to justify airstrikes on Syria, without waiting for the results of an independent investigation. The Syrian government denies any role in such attacks, emphasising that all of its chemical weapons' arsenal had been destroyed years ago, with a UN body overseeing the process.
* al-Nusra Front [The Nusra Front, Jabhat al-Nusra] — a terrorist organisation banned in Russian and a number of other countries