President Vladimir Putin of the Russian Federation has drawn a line in the sand over Syria, the government of which he is determined to protect from overthrow. Not since the end of the Cold War in 1991 has the Russian Bear asserted itself so forcefully beyond its borders in support of claims on great power status. In essence, Russia is attempting to play the role in Syria that France did in Algeria in the 1990s, of supporting the military government against rebels, many of them linked to political Islam. France and its allies prevailed, at the cost of some 150,000 dead. Can Putin and Syrian President Bashar al-Assad pull off the same sort of victory?

Even as Damascus pushes back against the rebels militarily, Putin has swung into action on the international and regional stages. The Russian government persuaded U.S. Secretary of State John Kerry to support an international conference aimed at a negotiated settlement. Putin upbraided Israeli Prime Minister Benjamin Netanyahu over his country’s air attacks on Damascus. Moscow is sending sophisticated anti-aircraft batteries, anti-submarine missiles and other munitions to beleaguered Assad, and has just announced that 12 Russian warships will patrol the Mediterranean. The Russian actions have raised alarums in Tel Aviv and Washington, even as they have been praised in Damascus and Tehran.

The Syrian regime has been on a military roll in the past few weeks. It has made a bloody push into the hinterlands of Damascus, fortifying the capital. With Hezbollah support, it has assaulted the rebel-held Qusair region near northern Lebanon, an important smuggling route for the rebels and the key to the central city of Homs. The Baath government needs to keep Homs in order for Russia to resupply the capital via the Syrian port of Latakia on the Mediterranean. The Syrian government’s victories would not have been possible without Russian and Iranian help.

Regionally, a Moscow-Tehran axis has formed around Syria that is resisting Qatari and Saudi backing for the rebels. The increasing dominance of rebel fighting forces in the north by radical groups such as the al-Nusra Front, which has openly affiliated itself with al-Qaida, has resulted in a falloff of support for the revolution even in Saudi Arabia. Most Syrians who oppose the government are not radicals or even fundamentalists, but the latter have had the best record of military victories. Russian characterizations of the rebels as radical terrorists are a form of war propaganda; however, they have been effective. The Saudi and Jordanian plan to create a less radical southern opposition front at Deraa has met with a setback, since the regime recaptured that city last week. Doha and Riyadh are reeling from the Russia-backed counteroffensive.

At the same time, Russian Foreign Minister Sergei Lavrov pulled off a coup two weeks ago by persuading Kerry to support the international conference on Syria, to which both the Baath government and the rebels would be invited, as a way station toward a negotiated settlement of the conflict (Russia’s holy grail). The agreement represented a climb-down for the Obama administration, which had earlier insisted that Assad leave office as a prerequisite to a resolution, language that the joint Russian-American communique issuing from the Kerry-Lavrov meeting in Moscow conspicuously avoided. Lavrov, a South Asia expert and guitar-playing poet, speaks as though what happened in Yemen, with a negotiated solution and a government of national unity, is a plausible scenario for Syria. But so much blood has been spilled in the latter that a military victory by one side or the other now seems far more likely.

When sources in the Pentagon leaked the information that explosions in Damascus on May 5 were an Israeli airstrike, Putin appears to have been livid. He tracked down Netanyahu on the prime minister’s visit to Shanghai and harangued him on the phone. The two met last week in Moscow, where Putin is alleged to have read Netanyahu the riot act. Subsequently, the Likud government leaked to The New York Times that its aim in the airstrike had been only to prevent Syrian munitions from being transferred to Hezbollah in Lebanon, not to help in overthrowing the Baath government. The Israelis were clearly attempting to avoid further provoking Moscow’s ire, and wanted to send a signal to Damascus that they would remain neutral on Syria but not on further arming of Hezbollah.

Putin, not visibly mollified by Netanyahu’s clarification, responded by announcing forcefully that he had sent to Syria Yakhont anti-ship cruise missiles and was planning to dispatch sophisticated S-300 anti-aircraft batteries. Both U.S. Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey and Israeli military analysts protested the Russian shipments. Although Netanyahu went on insisting that Israel would bomb Syria at will when it suspected supplies were being sent to Hezbollah, Putin had clearly just raised the risks of such intervention.

Russia’s motives have sometimes been attributed to the profits it realizes from its arms trade with Syria, going back to the Soviet era, but that business is actually quite small. Others have suggested that Syria’s leasing to Russia of a naval base at Tartous, Russia’s only toehold on the Mediterranean, is a consideration. Rather, Russia’s support of Assad is part of its reassertion on the world stage as a great power with areas under its control. Putin wants to raise Russia from the world’s ninth- to fifth-largest capitalist economy. Smarting from the aggressive American expansion of NATO into Eastern Europe and the planting of U.S. bases in Central Asia, Moscow is determined to recover its former spheres of influence. In addition, some senior Russian military analysts see “color revolutions” as a ploy by the U.S. Central Intelligence Agency to overthrow unfriendly governments and then to plunder the resulting weak states of their resources, a tactic they fear menaces Russia itself. Drawing a line at Syria, in this view, is a way of underscoring that Putin’s own neo-authoritarian regime will not go quietly.

Russia is only a 24-hour drive from Aleppo, Syria’s northernmost metropolis. Having crushed a Muslim fundamentalist uprising in Chechnya and Dagestan at the turn of the century, and having stood up a friendly Chechen state government in the aftermath, Moscow is wary of the spread of radical Muslim movements in the nearby Levant. Moreover, some 10 to 14 percent of Syrians are Christians, many of them belonging to the Eastern Orthodox branch that predominates in Russia itself. The Russian Orthodox Church, a key constituency for Putin, has opposed the overthrow of the secular Baath government, seeing it as a protector of those coreligionists.The thinking of the Russian foreign ministry is clear from its Saturday press release on the revival of the radical Sunni insurgency in Iraq in recent weeks. Complaining about what it termed terrorist attacks in Mosul and Baghdad, the ministry’s website said, according to a translation done for the U.S. government’s Open Source Center, that “We are particularly concerned about growing sectarian tensions in Iraq, which are turning into a direct armed confrontation between radical elements in the Shi’a and Sunni communities. This is largely due to the crisis situation in neighboring Syria and the spread of terrorist activities of militants operating there.” In other words, Russia sees the Syrian revolution as dominated by al-Qaida-linked groups such as the al-Nusra Front. Moscow views the civil war as a destabilizing event with the potential for radicalizing the Middle East, which it views as its soft underbelly.

The momentum of the Syrian rebels has palpably slowed in the last month, as Putin’s riposte has stiffened the resolve in Damascus and given its military the wherewithal to regain territory. The Russian president is weaving a protective web around his client, fending off the Wahhabi winds of Muslim fundamentalism blowing from the Arabian Peninsula. He has also pushed back against opportunistic Israeli intervention, worried that it might further destabilize Damascus. At the same time, he has impressed on Washington the need for a negotiated settlement, an idea that President Obama, long skittish about sending troops into further possible Middle East quagmires, has begun to tolerate. Putin’s supply of powerful new weapons systems to Assad’s military, and his dispatch of warships from the Russian Pacific fleet through the Strait of Gibraltar into the Mediterranean, make clear that the full force of Russian military might is, if need be, at the service of its Baath client. Putin’s gambit may or may not prove successful, but he is indisputably demonstrating that the age of the sole superpower and of American unilateralism is passing in favor of a multipolar world.