MOSCOW — Russia on Saturday said Syrian rebels were preparing a chemical attack in Idlib province which will be blamed on Damascus and used as a pretext for Western powers to hit government targets in the war-torn country.

Moscow’s accusation comes after US President Donald Trump’s national security adviser John Bolton this week said Washington will respond “very strongly” if Syrian President Bashar Assad uses chemical weapons in an offensive to retake Idlib, one of the last rebel held provinces in the country.

Russian defense ministry spokesman Igor Konashenkov said in a statement that the jihadist group Hayat Tahrir al-Sham is “preparing another provocation of the ‘use of chemical weapons’ by Syrian government forces against the peaceful population of the Idlib province.”

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He said the group delivered “eight chlorine tanks” to Jisr al-Shughur town in order to “stage” the attack and that these were later taken to a village eight kilometers (5 miles) away.

The statement also said a group of militants “trained in handling poisonous substances under the supervision of specialists from the private British military company Oliva arrived in the town a day earlier.

“The militants have the task of simulating the rescue of the victims of the chemical weapons attack dressed in the clothes of the famous ‘White Helmets,'” it said.

Konashenkov accused British special services of being “actively involved” in the “provocation” which will “serve as another reason for the US, the UK and France to hit Syrian government targets with air strikes.”

In April, the US, France and Britain launched joint missile strikes on Syrian targets in response to an alleged chemical weapons attack in the town of Douma that left scores dead.

Russia stuck by its ally Syria and angrily insisted the Douma attack was staged by the White Helmets volunteer rescue service.

In Jerusalem on Wednesday, Bolton said Washington was “concerned about the possibility that Assad may use chemical weapons again.”

“Just so there’s no confusion here, if the Syrian regime uses chemical weapons we will respond very strongly and they really ought to think about this a long time,” Bolton said.

Speculation is increasing that there could be a Russian-backed government assault on Idlib, one of the so-called “de-escalation” zones set up as a result of talks by Russia, Turkey and Iran last year.

On a visit to Moscow on Friday, Turkish Foreign Minister Mevlut Cavusoglu warned Russia that seeking a military solution in Idlib would be a “catastrophe” before meeting President Vladimir Putin.

Russian Foreign Minister Sergei Lavrov said the situation in Idlib is “multi-faceted” and called for separating out “the healthy opposition from terrorist structures.”

Damascus still holds the southeastern tip of Idlib, a strategically important province adjacent to Latakia on the Mediterranean coast that is home to Assad’s clan.

More than 350,000 people have been killed and millions displaced since Syria’s war started in 2011 with the brutal repression of anti-government protests.