The Iranian Foreign Ministry has strongly condemned Israeli Air Force's attack on a military airfield in Syria, saying that Tehran believes that the move was aimed at diverting attention from the "tragedy in Gaza".
Shi'ite-dominated Iran is Assad's main regional ally and has provided military and economic support for his conflict with a range of Sunni Muslim rebel and militant groups.
Iranian media on Monday evening reported that least three members of the Islamic Revolution Guards Corps (IRGC) had been martyred in a deadly attack on a Syrian military airport. Observers said 14 people were killed in the attack.
For his part, Velayati affirmed that Iran will continue to support Syria in its battle against terrorism which targets its unity and the region's stability, stressing that his country will continue to boost its strategic relations with Syria.
Iranian President Hassan Rouhani's participation in the meeting, alongside Russian President Vladimir Putin and Turkish President Recep Tayyip Erdogan, is perceived by the defense establishment not only as a sign of gratitude to Iran for its efforts to help salvage the Assad regime in Syria, but also as a guarantee of Iran's future role there.
Israel's foreign ministry had no comment when asked about the accusations.
"Russia wants the U.S. out of Syria as soon as possible, so if we have a clash and Trump retreats, Putin scores twice", he added.
Monday's aerial attack struck an Iranian drone section of Syria's T4 base, which was under exclusive Iranian command, he said.
"The timing of the strike isn't coincidental", he said. Both Syria and Russian Federation denied the attack took place.
Mr Trump had earlier taken to Twitter to issue a warning to Syrian and its allies.
"Israel has been trying to convince Washington to adopt a more pro-active, anti-Iran strategy in Syria, and certainly sees Trump's rhetoric in the wake of the chemical attack as an opportunity". Area of atrocity is in lockdown and encircled by Syrian Army, making it completely inaccessible to outside world.
The raid came as worldwide outrage mounted over a reported chemical weapons attack on a rebel-controlled town outside the Syrian capital.