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Russia and the Syrian government warned the US in early September that they planned to carry out counterterrorism operations near a key US garrison in southeastern Syria known as al-Tanf, where several hundred Marines have been stationed since at least 2016.

But the US responded with a live-fire exercise, and the Russians backed down.

In fact, the al-Tanf garrison has long drawn the ire of Moscow, Tehran, and Damascus but all they've been able to do is complain about it.

The Russian state-owned media outlet Sputnik quoted Syrian Foreign Minister Walid Muallem as saying late last month that the US was "gathering the remnants of the Islamic State at this base in order to later send them wage war on the Syrian army."

Late last year, Russian Gen. Valery Gerasimov told Russia's Pravda that satellite and other surveillance data indicated "terrorist squads" were stationed at al-Tanf and that terrorists were "effectively training there."

Iran's Press TV cited Gerasimov's quote in an article published this past June titled "US forces training terrorists at 19 camps inside Syria: Russian expert."

Without any real evidence, US adversaries have lobbed many rhetorical attacks against the US forces accusing them of harboring or training terrorists at al-Tanf.

Damascus and Russian state-owned media even claimed in June that the US was preparing a "false flag" chemical attack at al-Tanf "identical to the kind that took place in Douma."

"The U.S. led Coalition is here to defeat ISIS, first and foremost, and that is the objective of the presence at al-Tanf," US Army Col. Sean Ryan, a spokesman for Operation Inherent Resolve, told Business Insider in an email.

"No U.S. troops have trained ISIS and that is just incorrect and misinformation, it is truly amazing some people think that," Ryan said.

The US has trained Syrian rebels at al-Tanf, namely a group called Maghawir al Thawra. Omar Lamrani, a senior military analyst at Stratfor, told Business Insider the group was "fairly secular by regional standards and has been at the forefront of the fight against ISIS."

Lamrani further described the idea that the US is training the Islamic State or like-minded groups at al-Tanf as "certainly absurd."

"To the Russians and Iranians, almost any group fighting against the Syrian government can be labeled a terrorist group," Lamrani said.

So why do Russia, Iran, and the Syrian government care so much about this garrison?

"I'd say that the primary reasons why Iran cares about it so much is, again, it blocks the Baghdad-Damascus highway," Lamrani said. Tehran uses the highway to transport weapons to the Syrian capital of Damascus, where the government is based.

"The reason they want the land route is that it's easier to bring [weapons] across land in greater quantities, and the shipping route is very vulnerable to Israeli interception, and the air route is expensive and often gets hit by Israeli airstrikes," Lamrani added.

Moscow, on the other hand, is upset about al-Tanf, according to Lamrani, because "it's the last area in Syria where the United States is involved with rebels on the ground that are not Syrian Democratic Forces."

The Russians and the Syrian government have "open channels" with the SDF and want to negotiate not fight with them, Lamrani added.

But Moscow, Tehran, and the Syrian government's ire might go beyond just stymieing the flow of weapons to Damascus and training rebels.

"There's a history at that garrison at al-Tanf," Max Markusen, an associate director and associate fellow of the Transnational Threats Project at the Center for Strategic and International Studies, told Business Insider.

"I think that the Syrian regime, the Russians and Iranians, would see it as a [symbolic] victory if the United States pulled out of there than just sort of tactical level objectives," Markusen said, adding that there's much resentment for the US having trained rebels at al-Tanf.

But they haven't sought to use force to expel US troops because "the costs of escalation are too high," Markusen said.

So they're relegated to discrediting the al-Tanf garrison.

Going forward, "we will continue to see an escalation of rhetoric," Markusen said, but "I don't think there's going to be a major outbreak of conflict."

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A US base in Syria is a huge thorn in Russia and Iran's side ...