"Hezbollah, which is backed by Iran and fought a 34-day war with Israel in 2006, said six of its members died in the strike." reuters

so, ... ( Obama understands that ) weakening  Assad ... 
would make an already bad situation much worse ( wsj )

... "a growing view in Washington that  Mr. Assad, while a huge part of the problem, may also now be part of the solution" ... ( wsj )

"It has been nine years since the last major Israeli-Hezbollah war." wsj

... "On Sunday, an Israeli helicopter fired two rockets from the occupied territories at al-Amal farms in Quneitra, killing six and causing severe injuries to a child." ...

... "For his part, Chairman of the Security Committee at the Iranian Shura Council Mohammad-Reza Mohseni  Sani strongly condemned the Israeli aggression on al-Amal farms in al-Quneitra, describing it as “An obnoxious act and a clear crime.” 

In a press statement issued on Tuesday, Mohseni Sani said that the terrorist attack against the Syrian territories indicates that the Zionist entity is not adhered to any international principles, affirming that the resistance will not be terrified by any threat or assassination and it is always ready for more sacrifices and for the martyrdom.

He reiterated that the response to this heinous act of the Zionist entity will be “decisive and harsh”, adding that this crime will lead to a fourth defeat for the Zionist entity." ...

http://www.sana.sy/en/?p=25676