Up to noww, Israel had remained completely silent on the issue. It was only when it became clear that Syrian weapons were being transferred to Hezbollah that Israel attacked. Israel knows that the next Syrian regime may be no better for Israel. And as for your last sentence, change the last two words to read "existence".
Saudis warns U.S. that 9/11 responsibility law would erode investor confidence in America (Reuters)
from the article: Nukes-for-Assad trade in the offing?