![20180210_STP003_0](https://paranoidpress.com/wp-content/uploads/2018/02/20180210_STP003_0.jpg)
According to the Russian Ministry of Defence, which has so far refused to say who it thinks was responsible for the attack, the drones were guided by GPS and had a range of 100km. The electronics involved were off-the-shelf components, and the total cost of each drone was perhaps a couple of thousand dollars.
Source: Home-made drones now threaten conventional armed forces – Drones and guerrilla warfare