Igor Sutyagin, a Russian military expert with the Royal United Services Institute in London, said that for Israel training against the Crete S-300 would be "precisely what you need" to study the system's radar frequency, pattern and reach.
"If you know all these details then you are perfectly fitted to replicate this same signal, which means you have a chance to imitate, to sort of bluff-echo" the S-300, he said.
"You can brutally jam it," he said. "You can take the signal and return it, and then you send another ping which imitates the same signal. So instead of one target, the radar operator sees three, five or 10 and he does not know where to fire."
Tal Inbar, senior scholar for the Fisher Institute for Air and Space Strategic Studies near Tel Aviv, said S-300s in areas where Israel operates or might want to operate would challenge its advanced, U.S.-backed military - but not insuperably so.