Russia's ambassador to Tehran has stressed that Iran's presence in Syria, similar to the presence of Russian military forces, is upon a request by the government in Damascus to contribute to fighting terrorism, and hence it is legal.

Russian Ambassador to Iran Levan Dzhagaryan said that Iran's presence in Syria is legal, the Russian daily Kommersant cited him as saying.

'The Iranians are there, as well as the Russian military, at the invitation of the legitimate government of the Syrian Arab Republic and participate in the operation to destroy the terrorists,' he said.

Meanwhile, an international adviser to the Leader of the Islamic Revolution, said the Russian Federation has not expressed opposition to the Islamic Republic’s presence in war-stricken Syria.

Speaking to Russia’s RT television network, Velayati rejected claims that Russia has tried to end Iran’s presence in Syria and said he has not heard anything from Russian officials so far about Moscow’s opposition to the Iranian advisory presence in the Arab country or other regional countries.

Russia's ambassador to Tehran, Dzhagaryan, also noted that the Russians are concerned over possible confrontation between Iran and the Zionist regime of Israel. 

Dzhagaryan said: "Conflicts may occur, and we are naturally concerned about the possibility of military confrontation between the Iranian and Israeli forces in Syria. But we are doing everything possible to prevent such a situation".

 The Russian diplomat emphasized that both Moscow and European capitals are ready to defend Iran's right to do business in face of the US sanctions

Recently, Iran's First Vice-President Eshaq Jahangiri said that his country will stand by the Syrian nation as it helped the country during the war against terrorist groups.

'They (the European people) have to be thankful of the fights of the Syrian people against the terrorists,' Jahangiri said. 

Iran and the five permanent members of the UN Security Council (the US, France, Britain, China, and Russia) plus Germany signed the nuclear deal in 2015. Iran accepted to curb its nuclear program in exchange for economic sanctions relief. 

The US President Donald Trump withdrew from the deal in May, calling it the worst deal ever. Washington has also re-imposed the economic sanctions the first set of which will take effect on August 6.