The Ukraine’s capital are preparing themselves for a deadly barrage of chemical biological and nuclear attacks by Russian forces which is “highly likely” if Putin’s army struggles.

A chemical weapons expert warned that chemical weapons ended the four year siege in the Syrian city of Allepo after devastating chlorine barrel bombs were dropped for 13 days.

Colonel Hamish de Bretton-Gordon OBE, a chemical weapons expert and fellow at Magdalene College, Cambridge, told Express.co.uk, “Chemical weapons broke the four-year siege of Aleppo in 13 days of chlorine barrel bombs in December 16 and I think this had a profound effect on the Russians.

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“If you have no morals or scruples you would use chemical weapons all the time as they are morbidly brilliant for fighting in towns and cities.

“Heavier-than-air chlorine sinks underground and kills people in their bunkers or forces above ground where there are captured or shot. They were frequently successful in sieges in Syria after Aleppo.”

US national security adviser Jake Sullivan warned Nikolay Patrushev from Russia’s Security Council, of the consequences “of any possible Russian decision to use chemical or biological weapons in Ukraine.”

Colonel de Bretton-Gordon said, “There has been a notable decrease in overall Russian air activity over Ukraine in recent days, likely due to the unexpected effectiveness and endurance of Ukrainian Air Defence Forces.”

The chemical weapons expert  warned, “The Russians have an extant chemical weapons programme based around Novichok, the deadly nerve agent which he used to attack Sergei Skripal in my hometown of Salisbury.

“But I think the Russians will use toxic industrial chemicals like chlorine which were used so successfully in Syria.

“They are easily deniable as chlorine is widely available in Ukraine and the Russians have already accused the Ukrainians, US and UK of planning chemical attacks, the so-called False Flags – again straight out of the Syrian playbook.”