FNA- Senior Iranian and Russian officials in a secret meeting in Tehran conferred on ways to give a response to the Sunday night Israeli missile strikes against the T4 airbase in Syria which killed a number of military advisors of Iran, an Arabic-language media outlet reported.

The Arabic-language al-Mayadeen news channel reported on Wednesday that the meeting was held between Secretary of Iran's Supreme National Security Council (SNSC) Ali Shamkhani and Russian President Vladimir Putin's Special Envoy to Syria Alexander Lavrentiev.

During the unscheduled meeting, both sides reviewed the recent attack by Israel on Syria and the US President Donald Trump’s threat of military intervention in Syria.

According to al-Mayadeen, due to its confidentiality, the meeting was not covered by the media.

No official source has yet commented on the report.

The Israeli airstrike T4 airbase in Homs which resulted in the martyrdom of 7 Iranian military advisors in Syria as well as Iran’s decisions in this regard were among other topics discussed by both sides, it added.

Iranian Supreme Leader's top aide for international affairs Ali Akbar Velayati cautioned on Tuesday that Israel should be waiting for a powerful response to its Sunday night airstrikes on the T4 airbase in the Syrian province of Homs.

Velayati was quoted by al-Mayadeen news channel as saying upon arrival in Damascus on Tuesday that the Israeli missile attack on the Syrian T4 airbase "will not remain unanswered".

He also lauded the Syrian army for its "vital" victories against the terrorists in the Eastern Ghouta of Damascus.

Velayati was in Damascus at the invitation of the Syrian officials for the latest coordination in the fight against the terrorist groups.

Tehran declared on Monday that four of its military advisers have been martyred in Israel's overnight airstrikes on T4 airbase in Homs, although later reports said the number of the Iranian casualties stand at 7.

Two Israeli fighter jets attacked the Syrian army's T4 military base in Homs province from the Lebanese airspace on Sunday night, killing and wounding over a dozen militaries, including 7 Iranian military advisers.

The Russian Defense Ministry said on Monday that Israeli F-15 fighter jets targeted Syria’s airbase. The warplanes fired eight guided missiles, but Syrian air defense units shot down five before they could hit the airfield. Three of the missiles reached the Western part of the airfield.

The Israeli fighters did not enter Syrian airspace and launched the strikes while flying over Lebanon.

The Tel Aviv regime has launched sporadic attacks against various targets on Syrian soil over the past few years, in assaults slammed by Damascus as attempts to boost terrorist groups who have been suffering heavy defeats on the battlefield with President Bashar Assad forces.

The latest such attacks took place in mid-February when Israel bombed a Syrian Army facility in Central Syria. Damascus shot down at least one Israeli F-16 returning from the bombing raid.

The Syrian army has seized Israeli-made arms and military equipment from militants fighting pro-Damascus forces on numerous occasions ever since the war of militancy started in the country. Israel has also been providing medical treatment to the militants wounded in the Arab country.