Report from IsraelToday & Reuters:

“We have been informed that the Russians are entering into active intervention,” Amos Gilad, senior adviser to Israeli Defense Minister Moshe Yaalon, said at a recent security conference.

Ram Ben-Barak, director-general of Israel’s Intelligence Ministry, told Reuters that this development “could [have] ramifications for us, certainly.”

The first, and most obvious, concern is that periodic Israeli strikes on Syrian targets could inadvertently result in Russian casualties, bringing Jerusalem and Moscow into direct conflict.