FNA- Iranian Supreme Leader's top adviser for international affairs Ali Akbar Velayati underlined support for Syria's right to defend itself against foreign attacks after Damascus shot down an Israeli fighter jet.

"If the Zionist regime wants to make aggression against Syria or any other state's airspace, the regional countries are entitled to use their space and the Syrian government and nation was entitled to respond to the Zionist regime's aggression to make them regret," Velayati told reporters in Tehran on Monday.

Elsewhere, he underlined Iran's continued advisory role in Syria to help the country's government and people, and said, "Iran's presence in Syria is based on an agreement between Iran and the Syrian Arab Republic."

Syria's Air Defense Units targeted an Israeli warplane after it raided the Syrian Army positions in the Central part of Syria.

The state-run SANA news agency quoted a field source as saying that an Israeli warplanes embarked on targeting a military base of the Syrian Army in Central part of the country on Saturday morning, adding that the Syrian air defense units tracked the warplanes and targeted more then one of them.

In the meantime, an Israeli media source reported that one of the Israeli jets was downed in al-Jalil region in Northern occupied Palestine by the Syrian air defense units' fire in the occupied Golan region.

In relevant remarks on Sunday, Secretary of Iran's Supreme National Security Council (SNSC) Ali Shamkhani rejected Israeli claims that the F16 fighter jet downed by the Syrian army was on a mission to target an Iranian drone, stressing that Damascus move contained a vital message to Israel.

"There is an important point in the recent events and in targeting an Israeli fighter jet: the Syrian army showed to the Zionists that the era of hit-and-run has ended," Shamkhani told FNA in Tehran during the nationwide rallies to commemorate the anniversary of the victory of the Islamic Revolution in Iran in 1979.

Asked about Israeli officials' claims that they had flown the F16 fighter jet, which was downed by the Syrian army, to intercept an Iranian drone flying over the occupied territories, he said, "It is an irrational claim as no F16 fighter takes off to target a drone."

Shamkhani also dismissed the Zionists' claim that they have attacked a Syrian-Iranian base in Syria, and said, "We play an advisory role in Syria."

The Arabic-website of Russia's Sputnik quoted Spokesman for the Israeli Army Avikhai Adra'ei as saying that the Syrian air defense units targeted an Israeli F16 fighter jet in Northern part of Palestine, adding that the downed warplane's pilots are alive and in good health condition.

The Israeli spokesman further claimed that an Iranian drone entered airspace of the occupied Palestine, but an Israeli combat helicopter targeted it. Iranian officials have rejected the claim.

The Joint Operations Room run by the allied forces of Syria, Hezbollah, Iran, and Russia said the drone never crossed the border into Israel, adding that Israel has raided its drone base at the T4 airbase in Central Homs province in Central Syria far away from the Israeli border. The operations room said the drones operating at the base are tasked with collecting vital intel on ISIL in Syrian territories. It also warned that the incident crossed the border of its tolerance, implying that it would reciprocate any further aggression by Israel.

In the meantime, other sources said that the two pilots of the down Israeli jet were injured and one of them is in critical condition.

Some sources reported that the badly inured pilot was wounded before ejecting form the warplane.

Damascus stressed on Thursday that the repeated Israeli attacks on Syria are a continuation of Israel�s aggressive approach represented by supporting terrorist groups to prolong the crisis in Syria and to raise the morale of the terrorists.

In a letter sent to the United Nations Secretary General Antonio Guterres and the UN Security Council, Syria's Foreign Ministry stressed that the continuation of Israel�s attacks only serves to support terrorist groups and to prolong the crisis in Syria.

"The government of the Syrian Arab Republic reiterates its warning to Israel on the serious repercussions of its attacks on Syria, its continued support for armed terrorist organizations, and its continued occupation of the Arab territories, including the occupied Syrian Golan, and it holds Israel fully responsible for that,� it said.

It further went on to condemn the Tel Aviv regime's latest attack in which Israeli aircraft launched missiles from the Lebanese airspace on an area in Damascus countryside.

The letter noted that the attack coincides with "the launching of more than 1,000 rockets and mortar rounds during the past few days on neighborhoods, suburbs, diplomatic missions, service facilities, and churches in Damascus and other cities, where dozens of civilians were killed and hundreds others were wounded, most of them women and children."

The letter concluded by calling on the UN and the Security Council to condemn such actions and to take firm and immediate measures to halt those attacks.

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.

On several occasions, the Syrian army has confiscated Israeli-made arms and military equipment from militants fighting pro-Damascus forces. Israel has also been providing medical treatment to the extremist militants wounded in Syria.