According to a breaking news report on Lebanese news stations, Israeli warplanes have attacked a site in Syria near the city of Homs.
"All the Lebanese are prepared to fight against Israel", Aoun told a Kuwaiti newspaper Al-Rai.
The Israeli air force says it has struck arms convoys of the Syrian military and its Lebanese ally, the Iran-backed Hezbollah, almost 100 times in recent years.
The so-called Britain-based Syrian Observatory for Human Rights said loud explosions were heard south of Homs, from the location of a Syrian military base.
During the past few years, Israel has frequently attacked military targets in Syria in what is considered as an attempt to prop up terrorist groups that have been suffering heavy defeats against Syrian government forces.
The Israeli army refused to comment on the report.
In March, Defense Minister Avigdor Liberman threatened that if the Syrian military fired its air defenses at Israeli jets "we will destroy them without the slightest hesitation".
In official letters to the UNSC and UN Secretary-General António Guterres, the minister said that the global body needs to take immediate and firm actions in response to the airstrike and make sure that Israel refrains from carrying out additional attacks in the future.