"Here is what Major General Alexander Novikov, the head of the Russian General Staff’s department for the development of unmanned aerial vehicles, is reported to have said about the drones used in the attack

“The creation of drones of this class is impossible in an improvised manner. Their development and usage involved specialists, who had undergone special training in the countries manufacturing and using systems with unmanned aerial vehicles.

[The assembly and usage of unmanned aerial vehicles is a difficult engineering task that demands] special training, know-how in various scientific areas and practical experience in creating these devices.

Special software is also needed to use these drones. For efficient usage of ammunition information on exact target location and such parameters as altitude, flight and wind speed is required. This information cannot be obtained from the Internet.
Moreover, the explosives from the bombs carried by drones that attacked Hmeymim and Tartus bases in Syria cannot be made in makeshift conditions. There are several places where this substance is manufactured and one of them is Ukraine

Preliminary analysis has shown that the main explosive used in the bombs was pentaerythritol tetranitrate (also known as PENT, PENTA or TEN), which has a far higher yield than hexogen. This explosive is manufactured in a number of countries, including Ukraine’s Shostka chemical agents plant. It cannot be made in makeshift conditions or extracted from other ammunition,” he said.

Russia’s military has deciphered route data from the drones that attacked Russian bases in Hmeymim and Tartus in Syria, confirming that they had been launched from one place.

The slide shows deciphered data from the captured drones on their programmed and real flight routes and points of dropping munitions. One drones was equipped with a video camera and designed for controlling and adjusting the strikes if needed.”

Putin says that the Russians know which intelligence agency this was, and in truth it is not difficult to join up the dots.

Almost certainly the Russians believe it was the intelligence agencies of either Israel or of the US, and most probably of the US.”"

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"Nur die Lüge benötigt die Stütze der Staatsgewalt. Die Wahrheit steht von alleine aufrecht."
Thomas Jefferson