• Washington should think more than twice about allowing Turkey and Saudi Arabia, its Sunni allies, militarily to engage their Shiite enemies in Syria. Allowing Sunni supremacists into a deeper sectarian war is not a rational way to block Russian expansion in the eastern Mediterranean. And it certainly will not serve America’s interests.

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• Turkey and Saudi Arabia are too weak militarily to damage Russia’s interests. It is a Russian trap — and precisely what the Russians are hoping their enemies will fall into.

• Then there is the question of just how long Russia can afford to sustain its expensive military adventure in Syria. The Russian economy already has enough difficulties without having to bear the cost of Mr Putin’s latest act of military aggression.

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Russian President Vladimir Putin may well come to regret agreeing to Iran’s request for Moscow to intervene militarily in Syria’s brutal civil war.

The shooting down of a Russian warplane over the Syrian border by Turkey has graphically illustrated the risks Moscow faces after the Kremlin agreed to intervene on behalf of Syria’s beleaguered President Bashar al-Assad.

Mr Putin took his fateful decision to launch military action in Syria after meeting Major-General Qassem Soleimani, the head of Iran’s notorious Quds Force, in Moscow last August. Visiting Moscow shortly after the conclusion of June’s deal on the future of Iran’s nuclear programme (JCPOA), Soleimani delivered a blunt warning to the Russian leader that the Assad regime, Russia’s long-standing strategic ally in the Middle East, faced defeat without outside support.

Major-General Soleimani’s intervention was sufficient to persuade Mr Putin to enter the Syria fray, and within weeks Russian SU-24 Sukhoi bombers were regularly attacking the positions of opposition fighters, while forces from Iran’s Islamic Revolutionary Guard Corps (IRGC) have been brought in as reinforcements to bolster the ranks of pro-Assad Syrian Army forces and their Lebanese Hizbollah allies.

Yet, even before last week’s shooting down of a Russian SU-24 bomber by a Turkish F-16 fighter, there were clear signs that the new joint Russian-Iranian offensive is struggling to make headway against the Syrian rebels.

The first sign that Russia’s military intervention was not going according to plan came in October, when a Russian-backed plan to recapture the strategically important northern Syrian city of Hama was halted by stiff rebel resistance. Western intelligence sources say one decisive factor was the delivery to the rebels of 500 U.S.-made TOW anti-tank missiles, believed to have been provided by the Saudis.

In what has since become known locally as the “massacre of the tanks”, nearly 20 tanks and armoured personnel carriers fielded by the Assad regime were knocked out of action by the highly accurate TOW missiles.

Left: A Russian SU-24 bomber crashing after being shot down by a Turkish F-16 fighter on Nov. 24. Right: A Syrian rebel fighter prepares to fire a TOW missile at an Assad regime tank.

The fierce resistance put up by anti-government forces, which also claimed the lives of several senior Iranian Revolutionary Guard officers, dealt a serious blow to the morale of regime loyalists. It also resulted in a significant change of tactics on the part of the Russians who, aware of the limitations of the regime’s ground forces, have increased their reliance on air power to achieve their objective of defeating the rebels.

But while the Russians insist that their main attacks in Syria are being directed against fighters associated with the so-called Islamic State (ISIS), the reality is that they are bombing a large variety of anti-Assad forces – including those backed by the U.S.-led military coalition. One of the explanations given for the Turks shooting down a Russian SU-24 jet was that it had been bombing rebel groups backed by Turkey rather than ISIS, as the Russians later claimed.

The lack of progress made in Syria since Mr Putin first authorized Russian military involvement could soon have serious repercussions for the Kremlin.

Public support for the mission in Russia is starting to wane, after Investigators suggested the bombing of a Russian passenger jet over Egypt’s Sinai Peninsula at the end of October, killing all 224 on board, was carried out by ISIS terrorists in retaliation for Moscow’s military campaign.

Many Russians are also wary of the country becoming embroiled in another long, drawn-out military entanglement, as happened in Afghanistan in the 1980s and ultimately ended with the Soviet Union suffering an ignominious defeat.

And then there is the question of just how long Russia can afford to sustain its expensive military adventure in Syria. The Russian economy already has enough difficulties without having to bear the cost of Mr Putin’s latest act of military aggression. Moscow’s invasion of Afghanistan in the 1980s ultimately bankrupted the Soviet Union: the Syrian conflict could have a similarly catastrophic effect on modern Russia.

• Turkey shot down a Russian jet. No gain, but plenty of damage to its economy. Russia gave up one jet to Turkey and has made its military presence in Syria and the strategic eastern Mediterranean permanent.

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• Turkey can no longer speak to Russia about the possibility of ousting Assad.

• Putin seems to be making sure that NATO will do nothing.

At this year’s G-20 summit in Antalya, Turkey, Russian President, Vladimir Putin, said that the radical jihadist Islamic State (IS) was being financed by donors from at least 40 countries, including some G-20 member states — clearly pointing his finger, without naming names, at Saudi Arabia and Turkey. A few days later, two Turkish F-16 jets shot down a Russian SU-24 warplane, and claimed that the Russian jet had violated Turkish airspace for 17 seconds on the country’s Syrian border — a violation Russia denies. This was the first time a Soviet or Russian military aircraft was shot down by a NATO air force since the end of WWII.

Turkey and Russia have long been in a proxy war in Syria: Russia, together with its quieter partner, China, supports the Shi’ite Iran-backed Syrian regime of President Bashar al-Assad; and Turkey explicitly supports Assad’s Sunni opponents [“moderate” jihadists] — apparently in the hope of building a Muslim Brotherhood/Hamas-type of regime in Damascus that would be friendly to its own Islamist government. After the downing of the Russian jet, the Turco-Russian proxy war has become less proxy.

No more Mr. Nice Guy. Russian President Vladimir Putin twice refused to meet with Turkish President Recep Tayyip Erdogan on the sidelines of the Paris Climate Summit this week. Pictured: President Putin with then Prime Minister Erdogan, meeting in Istanbul on December 3, 2012. (Image source:kremlin.ru)

An angry Putin called the incident “a stab in the back.” He declined Turkish President Recep Tayyip Erdogan’s requests to discuss the issue. He twice refused to meet Erdogan on the sidelines of the Paris Climate Summit.

Russia’s foreign minister, Sergei Lavrov, quickly cancelled his official visit to Turkey — a visit that had been scheduled for the day after the downing of the Russian jet. At the outset, NATO member Turkey had taught Russia a good lesson. In reality, judging from the consequences, it all looks like a Russian gambit, with Turkey shooting itself in the foot and risking a new NATO-Russia conflict.

Russia’s ire seemingly is being expressed in economic terms:

• Moscow said it will introduce visa restrictions for Turkish citizens, beginning Jan. 1, 2016.
• Russian authorities detained a group of Turkish businessmen on charges of “false statements about their trip to the country.”
• Press reports noted that Russia was considering limiting or excluding Turkish construction companies from the country, a potentially multi-billion dollar loss for the Turkish economy.
• Moscow warned its citizens against visiting Turkey — a ban that could deal a big blow to Turkey’s lucrative tourism industry. Last year 4.5 million Russians visited Turkey, mostly its Mediterranean coast. Russian tour operators were warned to suspend business with Turkey.
• The fate of two huge Turco-Russian energy projects remains unknown, as Russia’s energy minister, Alexei Ulyukayev, did not rule out sanctions hitting the Turkish Stream gas pipeline and a planned Russian nuclear energy plant in Turkey. Turkey buys about 55% of its natural gas from Russia. Its second largest gas supplier is Iran, Russia’s ally — and Turkey’s rival — in Syria.
• Russia’s Minister of Agriculture, Alexander Tkachev, said that Russia would be replacing Turkish food imports with goods from Iran, Israel and Morocco.
• Shipments of wheat to Turkey from key Russian ports were put on hold.
• The Kremlin officially announced a wide range of sanctions on Turkey, including a ban on Turkish workers (with estimates that 90,000 will be fired by Jan. 1, 2016), restrictions on imported goods and services from Turkey and calls for “strengthening of port control and monitoring to ensure transport safety.”
• Around 1,250 trucks carrying Turkish exports were blocked from entering Russia on Nov. 30 and were stranded at border posts, awaiting clearance.
• Russian soccer clubs will be banned from signing Turkish players during the upcoming winter break.

All of that is commercially punitive. There is a more serious side of the Turco-Russian conflict that concerns NATO and western interests in the Middle East.

Russian Defense Minister Sergei Shoigu announced on Nov. 25 that Russia would deploy S-400 surface-to-air missile systems in its Hmeymim air base in Syria.

Turkey shot down a Russian jet. No gain, but plenty of damage to its economy. Russia gave up one jet and has made its military presence in Syria and the strategic eastern Mediterranean permanent. It has reinforced its bases in Syria and intends to build a new military base there. Turkey can no longer speak to Russia about the possibility of ousting Assad.

In a further move to escalate tensions, the Russian General Staff deployed one of its largest air defense ships at the edge of Turkish territorial waters in the Mediterranean. Russian military spokesman General Sergei Rudskoi said that Russian bomber aircraft would be “supported by chasers, and any kinds of threats will be responded to instantly.” Accordingly, The Moscow, one of the Russian Navy’s two largest warships and the flagship of Russia’s Black Sea Fleet, will be deployed where Turkey-Syria territorial waters connect.

In addition, Putin issued orders to deploy nearly 7,000 troops, plus anti-aircraft missiles, rocket launchers, and artillery to the Turkish border, and asked them to be in readiness for full combat.

There have been other military repercussions, too. Since the shooting down of the Russian jet, the Russian military has been regularly pounding the Syrian villages near the Turkish border that populated by the Turkmen, a Turkish ethnicity that supports jihadists in Syria — and is supported by Ankara. The Russians also have been hitting Turkish aid convoys bound for Turkmen villages. More than 500 Turks and Turkmen have been killed in Russian airstrikes. Meanwhile, the U.S.-led allied air strikes against IS have come to a halt. Neither Washington nor Ankara is keen for another conflict with Russia. So, IS and Russia keep on flourishing.

The Russian military has scrapped all contacts with the Turkish military, possibly waiting for the first Turkish military aircraft that violates foreign airspace to shoot.

Turkey has every liberty to challenge Russia and, inevitably, become the victim. But with its geostrategic, Islamist ambitions, it is exposing NATO allies to the risk of a fresh conflict with Russia — and at a time when the wounds of previous conflicts remain unhealed.

Putin has accused Turkey’s leaders of encouraging the Islamization of the Turkish society, which he said was a “problem.” He was not wrong. In fact, Islamism and neo-Ottoman ambitions are the source of Turkey’s (not-so) proxy war with Russia in the Syrian theater. Although Turkey, officially, is a NATO member and part of the allied campaign against IS, its Sunni Islamist ambitions over Syria hinder the global fight against jihadists. A Turco-Russian conflict is weakening the fight.

Putin seems to be making sure that NATO will do nothing.

Burak Bekdil, based in Ankara, is a Turkish columnist for the Hürriyet Daily and a Fellow at the Middle East Forum.