Russia reveals terrorist drones captured in Syria are so advanced they could pose a threat anywhere in the world and are immune to jamming technology

• The drones could not have been made without foreign help, Russia says 
• They carried sophisticated software  and precision-guided weaponry
•  The explosives they carried were 'stuffed with ball bearings'
•  The Pentagon has denied any involvement in the weekend drone attacks

Drones used to attack two Russian military bases in Syria were so high-tech they were designed to offset jamming technology, were capable of launching precision strikes and could not have been made without foreign assistance, the defence ministry in Moscow has said .

The ministry's drone department head Gen Alexander Novikov said the drones used in the weekend's raids differed from the rudimentary craft earlier used by rebels in Syria. 

The attacks required satellite navigation data that are not available on the internet, complex engineering works and elaborate tests, Gen Novikov said.