MOSCOW (AP) — Moscow joined the fight in Syria to return to relevance in international diplomacy.

It has succeeded by anyone's measure — and Russia hopes to use its air power to dictate the terms of a cease-fire and prospective peace talks.

Russian warplanes have helped the Syrian army make broad advances and close in on the country's biggest city, Aleppo. Meanwhile, the Western-backed opposition is fractured and weakened.

So as talk turns to a cease-fire later this week, Syrian President Bashar Assad, Moscow's sole ally in the region, is in a stronger position than he has been in years.

What's more, Russia has cast itself as an indispensable global player that holds the key to the settlement of a nearly five-year conflict that has flooded Europe with refugees.

And the United States can't hope to push forward its agenda of ending the war without overtures to Russia.

But it is far from smooth sailing for Moscow's strategy.

Turkey, Saudi Arabia and other regional players that have backed Assad's foes are loath to see the Syrian ruler strengthen his grip on power.

They have been mulling the deployment of ground troops to Syria, which could trigger broader hostilities and raise the threat of confrontation between their forces and the Russian military.

For its part, the United States sees Assad as the chief obstacle to peace and has been reluctant to engage in any military-to-military dialogue with Russia.

Still, Russian President Vladimir Putin appears eager to raise the stakes, hoping that Assad's siege of Aleppo will further strengthen Russia's hand.

The impact of Moscow's airstrikes appears particularly significant given the modest size of the Russian force — just a few dozen jets.

But they have operated at a frenetic pace, each flying several sorties a day for a total of more than 6,000 combat missions in 4 1/2 months.

The campaign, Russia's first military operation outside the former Soviet Union since the 1991 Soviet collapse, has demonstrated the new capability of the nation's resurgent military and allowed Russia to test its latest weapons in combat for the first time.

In one example, the military tested its new long-range cruise missiles, firing them from all possible launch platforms — strategic bombers, surface warships in the Caspian Sea and a submarine near Syria.

Moscow has denied any intention to open more air bases in Syria in addition to the Hemeimeem air base in Syria's coastal province of Latakia, the well-protected heartland of Assad's Alawite sect.

The Russian military says it makes little sense to allocate extra assets to the country because it takes just 15 minutes for Russian warplanes from Hemeimeem to reach any area in Syria.

Russia has deployed an unidentified number of advisers to train Syrian troops to use Russian weapons and help coordinate air attacks, but Putin has firmly ruled out ground action.

By operating from Hemeimeem, which lies deep inside government-controlled territory, Moscow has minimized the risk of casualties from militant incursions.

So far, the Russian military has lost three men in Syria: a pilot killed when his warplane was downed by a Turkish jet in November, a marine who died on a mission to rescue that pilot's crewmate, and a Russian military adviser who died in mortar shelling at the front line.

By limiting its presence in Syria, the Kremlin has been able to keep spending on its military action to an estimated $2 million to $4 million a day, an amount easily sustainable even for the crisis-stricken Russian economy.

At such costs, the Kremlin could maintain its air campaign indefinitely.

There is no such reservoir of patience among the United States' European allies, who struggle to cope with the continuing influx of refugees from the conflict.

Russia began its air campaign on Sept. 30, four years after the war began, and its effect soon became visible as Assad's military launched a multipronged offensive.

The main Syrian army efforts are now focusing on Aleppo, Syria's largest city and commercial capital, which has been split between the government and its opponents since 2012.

In recent weeks, Assad's troops backed by Hezbollah and Iranian forces have methodically cut supply lines, forcing more than 50,000 civilians to flee to the nearby Turkish border. Russian warplanes have maintained constant pressure on the anti-government forces, striking their strongholds and depots and chasing their convoys.

There are risks to the strategy, as can be seen in Russian-Turkish tensions after NATO member Turkey shot down the Russian jet. And in the crowded skies over Syria, U.S. officials say Russian pilots often perform risky maneuvers, flying extremely close to the U.S. warplanes.

Russian Foreign Minister Sergey Lavrov said last week that close coordination between U.S. and Russian military experts would be essential for securing a cease-fire. But Russia also vows to press its air assault against extremist groups, making clear that Moscow is in no rush to stop fighting.

Meanwhile, strikes on Monday will likely shine another spotlight on the plight of Syrian civilians.

Nearly 50 civilians were killed in missile strikes on hospitals and two schools in northern Syria, the United Nations said, deepening the country's humanitarian crisis.

Doctors Without Borders said at least seven people were killed early Monday when rockets hit a clinic that it supports in Idlib province. The group also said eight people were missing in what it called a "deliberate attack" on its facilities.

Doctors Without Borders did not say which group or military had fired the rockets, although rights groups have documented numerous Russian and Syrian government strikes on hospitals and medical facilities across the country. In total, at least five medical facilities and two schools in Idlib and neighboring Aleppo province were attacked on Monday, a U.N. spokesman said.

This report includes material from the Washington Post.

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