The war with Israel last month decimated a senior echelon of Irans military leadership, crippled its air defenses, and exposed the vulnerability of its air force. Within days, Israel had established aerial superiority, paving the way for US air strikes on Irans nuclear sites.

But the war also tested the limits of Irans alliance with Russia, which offered little more than diplomatic support to Tehran during the 12-day conflict.

With faith in Moscow at a low point, Iran is now urgently seeking to rebuild its defenses -- and is turning to China for the advanced military hardware that Russia has failed to deliver. But as Tehran pivots toward Beijing, it faces fresh obstacles and skepticism, revealing both the limits of its options and the depth of its strategic isolation.

Russia: A Strategic Partner In Name Only

Despite a recently signed strategic partnership agreement and years of close cooperation, Russias support for Iran during this crisis has proven largely rhetorical.

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As the reformist newspaper Shargh notes, this alliance, at critical junctures, is based more on shifting interests than on steadfast commitments.

While Russian President Vladimir Putin condemned the US strikes as unjustified and offered dialogue, he made no commitment to military assistance, with the Kremlin repeatedly insisting that the partnership deal has no provisions for military aid in times of war.

Russia's President Vladimir Putin (left) and Iranian Foreign Minister Abbas Araqchi shake hands during a meeting at the Kremlin in Moscow on June 23.

Ali Motahari, a former deputy speaker of Irans parliament, captured the growing sense of frustration in a post on X.

Henotedthat Russia has refused to sell the S-400 missile defense system to Iran, despite Tehran supplying Moscow with drones for its war in Ukraine, while providing such systems to Turkey and Saudi Arabia.

The ex-lawmaker argued that Russias reluctance is due to concerns Iran could use the S-400 against Israeli aggression, exposing the superficiality of the so-called strategic partnership that Putin touts.

Irans attempts to purchase advanced Russian military equipment -- including Sukhoi-35 (Su-35) fighter jets and Mi-28 attack helicopters -- have also stalled.

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According to Shargh, except for some trainer jets, none of the promised equipment has been delivered, with production issues in Russia and diplomatic pressure from Persian Gulf states, Israel, and the United States cited as key reasons.

This pattern of noncommitment has likely left Iranian officials and analysts openly questioning Russias reliability as an ally.

Chinese Reluctance And Realpolitik

With Russia distracted and unreliable, unconfirmed reports both in Iranian and Western media claim that Iran has turned to China in hopes of acquiring advanced military hardware, particularly the Chengdu J-10C multirole fighter jet.

Irans air force is severely outdated and ill-equipped to confront modern adversaries. Its fleet consists largely of aging US and Soviet-era aircraft acquired before the 1979 revolution, many of which are kept operational through cannibalized parts and domestic improvisation.

Chinese military personnel stand near a J-10C fighter jet during the 13th China International Aviation and Aerospace Exhibition, also known as Airshow China, in September 2021.

The J-10C is a 4.5-generation, single-engine fighter jet equipped with advanced avionics, AESA radar, and capable of deploying PL-15 long-range missiles. It is considered a credible, though not equal, challenger to Israels advanced F-35I fleet.

However, Chinese reluctance to supply Iran is pronounced, according to Andrea Ghiselli, a lecturer at the University of Exeter and head of research of the TOChina Hub's ChinaMed Project.

Beijing is trying to stabilize the relations with Washington to buy some time to further increase its tech and economic self-sufficiency, Ghiselli told RFE/RL. That's more important than rebuilding the Iranian Air Force.

Experts also agree that Chinas relations with Irans regional rivals contribute to its disinclination to beef up Irans military.

China has acted as an economic or geoeconomic actor in the Middle East, said Hamidreza Azizi, a fellow at the German Institute for International and Security Affairs.

He told RFE/RL that China values its relationships with Irans Sunni Arab neighbors in the Gulf Cooperation Council -- Qatar, Saudi Arabia, and the United Arab Emirates -- who are critical energy suppliers and trading partners but maintain cautious relations with Tehran.

Analysts widely agree that Chinas most effective way to support Iran is through continued oil purchases, which provide Tehran with vital revenue under sanctions.

For Beijing, maintaining access to energy and avoiding regional destabilization outweigh any potential benefits from selling advanced weaponry to Iran, Ghiselli argued.

Iran's Strategic Isolation

The events of the past weeks have exposed the depth of Irans strategic isolation.

Both Moscow and Beijing have prioritized their own interests and relationships with Irans adversaries over any formal alliance commitments.

As Shargh concludes, Russias unwillingness to go beyond political statements has severely damaged its credibility as an ally, while Chinas realpolitik ensures that any meaningful military support will remain out of reach.

Farzan Sabet, a managing researcher at the Geneva Graduate Institute, told RFE/RL that Tehran doesnt have any good options when it comes to foreign military partners.

Even if Tehran managed to purchase fighter jets from China, it would need a lot more than it can pay for to be able to maintain aerial superiority in future conflicts, at least in its own skies.

These are very, very expensive, Sabet said. With Iran being under sanctions, its not clear to anybody who would have the money to pay for it.