Have you heard of the term? If not look up Vietnam and Korea. In this case you may have Russia influencing Syria against the US/EU in Syria itself. Israel is a mere bit part in a conflict like this and should be very very wary of this occurring. However attacking "russian" shipments and Russian personnel could be disastrous. Israel overestimates it's military power, especially as it takes so much to heart it's losses. Understandably with such a small population. The wild card in all this is where Turkey will fall. If they side with Assad it's a truly frightening prospect. This whole situation makes Iran and Iraq (previously) seem like a bar brawl.
UN aid chief says no warring parties observed Yemen truce (Reuters)