Don't believe everything you hear!
The Russian's had the Skat before this and had massed nearly 1000 Tu-143's by the late 80's
https://en.wikipedia.org/wiki/Tupolev_Tu-143
So the Russian's do NOT owe their UAV program to Iran or Israel!
The TU-143 is a joke similar to Iran’s Karrar UAV in nature.
First of all skat concept came AFTER Iran capture of RQ-170, so please get your facts straight. RQ-170 incident happened in 2011, Scat “concept” was unvieled in 2013 and was clearly underwhelming even as a concept.
Russia lacked modern MALE UAVS hence the purchase of Heron UAV From Israel and ScanEagle Tot (Yasir UAV) from Iran. Russia makes it own ScanEagle clone now.
Before that incident neither Russia (skat 2013) nor China (Sky hawk 2018) had mass produced flying wing design aircraft let alone UAV flying wing design (as they are even harder to control). In fact China’s Sky hawk is just entering service!
As Iran’s general said Iran’s initial prototypes crashed repeatedly as it was very difficult building the necessary systems to keep a flying wing design stable when flying let alone without a pilot.
So sorry if I don’t believe your ridiculous explanation that Russia went from a cruise missile like based UAV (Tu-143) to MALE UAV to flying wing design all by itself. COINCIDENTLY enough this advancement all happened AFTER RQ-170 was captured by Iran and AFTER Iran gave ScanEagle copy to Russian general and AFTER Iran announced selling drone technology to Russia.
Something you simply don’t understand is that Iran is one of the first countries to use UAVs and UAVs in war (Iran-Iraq war) see the Ababil and Mohajer drones. Prior to Predator drone and ScanEagle capture Iran’s UAVs were hardly anything to write home about, but acceptable nonetheless. However, after the capture of foreign tech Iran truly reached MALE UAV status. It’s no coincidence that Iran’s most advanced UAVs are based on Israeli and US designs
I will go so far as saying that if Iran never captured RQ-170 it wouldn’t have a flying wing design for another 10 years from today! Even the most advanced experimental UAV project, Sofreh Mahi pre RQ-170, wasn’t even flying wing!