The Russia–Syria–Iran–Iraq coalition (RSII coalition), also referred to as 4+1 (in which the "plus one" refers to Hezbollah of Lebanon), is a joint intelligence-sharing cooperation between opponents of the Islamic State of Iraq and the Levant (ISIL) with operation rooms in Syria's Damascus and Iraq's Green Zone in Baghdad. It was formed as a consequence of an agreement reached at the end of September 2015 between Russia, Iran, Iraq and Syria to "help and cooperate in collecting information about the terrorist Daesh group" (ISIL) with a view to combatting the advances of the group, according to the statement issued by the Iraqi Joint Operations Command. The statement also cited "the increasing concern from Russia about thousands of Russian terrorists committing criminal acts within ISIS."
In October 2015, it was suggested that the Russia–Syria–Iran–Iraq coalition may have been devised during the visit by Qasem Soleimani, commander of the Iranian Quds Force, to Moscow in July 2015. During the early days of the operation, the Russian Air Force were backed by the Syrian Armed Forces, Army of the Guardians of the Islamic Revolution, and allied militias. The United States, along with its NATO and Arab allies, have criticized this coalition; most airstrikes during the first week of the campaign, they say, struck areas held by rebel groups opposed to both the Syrian government and ISIL.
Russia and Iran
For two and a half decades, the Russian elite were split on Iran. Some, like Russian Prime Minister Dmitry Medvedev, saw Iran as a bargaining chip in possible deals with the Western world. On the other hand, Eurasianists like Aleksandr Dugin wanted a Russo-Iranian alliance to counter Western influence.
Syrian Civil War
Syria's civil war started when opposing groups in the country protested against Assad's rule in early 2011, the protests ultimately turning violent and drawing-in regional opponents and supporters of Assad. The war is being conducted between numerous opponents and government parties. More than 250,000 people have been killed and more than 10 million displaced. With most opponents, and their western allies, demanding Assad's leaving as a Prerequisite for talks, efforts to find a solution have failed thus far. Recently Western countries have said Assad could play some role in a transition. Regarding the transitional period Assad has asserted that it was not western countries' job to decide on Syria's future. He has accused the US and its allies of hypocrisy for their support for insurgents, saying that air raids by Syrian jets, now combined by Russia, have been far more productive than anything performed by the year-long air operations by the US-led coalition. According to Assad the countries involved in Us-led coalition, themselves support terrorism, thus they cannot fight terrorism. That is why, he says, several months of fighting against terrorism, has resulted in spreading it.
After the loss of Idlib province to a rebel offensive in the first half of 2015, the situation was judged to have become critical for Assad's survival. High level talks were held between Moscow and Tehran in the first half of 2015 and a political agreement was achieved. In October 2015, it was suggested that the Russian operation in Syria may have been devised during the visit by Qasem Soleimani, commander of the Iranian Quds Force, to Moscow in July 2015, which was then denied by Russian officials. Responding to an official request by Syrian government, in September 2015, Russia sent its warplanes and other military hardware and combat troops to Bassel Al-Assad International Airport near Latakia to be ready for their operation. In 2016, Russia declared it would send humanitarian aid to Aleppo with the help of the Syrian Government. Russia also claimed that it would allow civilians to leave the city, and urged the Syrian Government to offer the chance for militants to surrender.
At the end of September 2015, a joint information centre in Baghdad was set up by Iran, Iraq, Russia and Syria to coordinate their operations against ISIL. According to Russian foreign minister Sergey Lavrov′s statement made in mid-October 2015, prior to the start of its operations in Syria, Russia invited the U.S. to join the Baghdad-based information center but received what he called an "unconstructive" response. Putin′s proposal that the U.S. receive a high-level Russian delegation and that a U.S. delegation arrive in Moscow to discuss co-operation in Syria was likewise declined by the U.S. Following an official request from the Syrian government for martial help against rebel and jihadist groups in Syria, the coalition started its work. It was generally thought that Iran would play a leading role in the ground operations of Syria's army and allies, whilst Russia would be leading in the air in conjunction with the Syrian air force, thereby establishing a complementary role. For Western countries and the Russia–Syria–Iran–Iraq coalition ISIS has been a common enemy, although each country has very different friends and opposing views of how to solve the crisis.
In an interview with Iranian TV, Assad said that the success of this agreement was vital to save the Middle East from destruction. He said that the year-long air campaign by US-led coalition had been counterproductive and had helped terrorism to spread and win new recruits, but that the new coalition of Russia, Syria, Iran, and Iraq, could achieve real results.
Other than being a crucial thoroughfare to Hezbollah in Lebanon, Syria has been the only consistent ally for Iran since the 1979 Islamic revolution in Iran. Iran has provided significant support for the Syrian Government in the Syrian Civil War, including logistical, technical and financial support. In April 2014, Hossein Amir-Abdolahian, the Iranian deputy foreign minister, said: "We aren’t seeking to have Bashar Assad remain president for life. But we do not subscribe to the idea of using extremist forces and terrorism to topple Assad and the Syrian government." On 24 July General Qasem Soleimani visited Moscow to devise the details of the plan for coordinated military action in Syria. In October 2015, it was suggested that the Russia–Syria–Iran–Iraq coalition may have been devised during his visit.
Citing two Lebanese sources, Reuters reported on October 1, 2015 that hundreds of Iranian troops arrived in Syria over the previous 10 days and would soon join Syrian government forces and their Lebanese Hezbollah allies in a major ground offensive backed by Russian air strikes. Iran has also been training Iraqi Shia militias who are fighting ISIS.
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