The U.S. Fighter jet in Iran was brought down by a shoulder fired missile like Osama Bin Laden Defeated Russia with in Afghanistan in the 1980s

The U.S. CIA sent Shoulder Fired missiles to Osama Bin Laden and the Mujahadeen of Afghanistan in the 1980s which defeated the Russian planes and tanks and Russia left with it's tail between it's legs after that humiliating defeat. This brought about the collapse of the Soviet Union and brought Glasnost in the late 1980s and eventually the Berlin Wall fell.

So, Iran is starting to do what the Mujahadeen of Afghanistan did to knock out all Russian planes and helicopters and tanks in Afghanistan in the 1980s which is not a good sign for the U.S. or NATO or ISRAEL. 

By the Way it is likely the KGB or now called the FSB of Russia sending the Shahed drones into Iran to use against Israel and all oil nations in the middle East because of what Trump has done in Iran by the way too. Let's hope it doesn't have the same effect that they did under Osama Bin Laden in Afghanistan in the 1980s.