Here’s a little more information about the Israeli drones supplied to Russia.
Are Israeli-built drones supporting Syria’s Assad regime? | Middle East Eye [March 4, 2016]
Israeli media is rife with speculation with Ynet, the Jerusalem Post, and Israel’s News24 suggesting that drones of Israeli origin may be supporting Assad. The possibility of Israeli technology supporting the so-called “axis of resistance” has the potential to be a major embarrassment for Israel, Russia and the Assad regime. Syrian government official news outlets have remained predictably silent on the allegations.
Israel stops supplying components for Russian drones | Real Russia Today [April 18, 2016]
In the recent past, Russian companies were actively trying to reach an agreement on joint activities with Israeli UAV manufacturers. However, after the checks carried out by the Israeli Defense Ministry, it became clear that all such agreements fall under the embargo.
As a result, negotiations were terminated by the Israeli side, and existing agreements were frozen.
Ultimately, as it was reported by the portal FlightGlobal, Russia loses the ability to produce drones.
Israel stops supplying components for Russian drones | Real Russia Today