China’s support for Iran shows its limits as US ramps up pressure on Tehran

China has long been a rare partner to Iran, with the economic heft to blunt the United States’ efforts to strangle the Iranian economy.

Yet even as China opposes US President Donald Trump’s latest pressure campaign, few observers expect it to go much further than the modest economic links it has thus far forged with Iran to shield it.

While China opposes the Trump administration’s military attacks and sanctions against Iran, Beijing’s relationship with Tehran is just one consideration in a foreign policy that seeks to balance relations with numerous countries, including the US and the Gulf states, limiting its appetite to prop up the Iranian leadership at any cost, analysts say.

“China, with broader global interests, can only actively promote de-escalation of the US-Iran conflict, and cannot and will not engage in fierce confrontation with the US for Iran’s sake,” said Hongda Fan, director of the China-Middle East Center at Shaoxing University in China.

“Ultimately, the US-Iran conflict must be resolved by the two countries themselves,” Fan said.

China and Iran share substantial trade links, particularly in energy, and a mutual suspicion of US dominance, but their relationship is heavily lopsided, with Tehran depending on Beijing far more than vice versa.

That asymmetry in ties was on full display this week at the annual gathering of the Shanghai Cooperation Organisation, a 10-member bloc widely seen as a counterbalance to US hegemony, where Chinese President Xi Jinping joined more than a dozen non-Western leaders, including Iranian President Masoud Pezeshkian.

While Iranian state media reported that Pezeshkian held a “brief meeting” with Xi on the sidelines of the summit in Bishkek, Kyrgyzstan, Chinese outlets made no mention of the encounter.

Xi immediately followed his attendance at the summit with his first visit to Egypt in a decade on Tuesday, using the visit to call on countries in the Middle East to oppose “external interference” and reiterate his calls for a diplomatic resolution to the Iran war.

As Iran’s top trade partner, China has taken up to 90 percent of Iranian oil exports since the US and Israel launched their war in late February.

Iranian crude, however, accounts for only about 2 percent of China’s overall energy mix.

While China’s oil purchases have been an economic lifeline for Tehran, Chinese importers have not been immune to fears of exposure to US sanctions.

China’s major state-owned refiners such as Sinopec and PetroChina have shunned Iranian oil for years, leaving the trade to independent “teapot” refiners with minimal links to the dollar-based global financial system.

Though the Trump administration has imposed sanctions on these “teapot” refiners and a limited number of China- and Hong Kong-based firms and individuals, it has yet to target major Chinese banks accused of facilitating Iranian oil purchases.

The Trump administration has hinted at targeting China’s financial system as part of its ramped-up sanctions campaign, dubbed “Operation Economic Outcast”, though analysts are sceptical that Washington will risk provoking Beijing’s ire as the sides seek to lower the temperature in their trade war before a scheduled summit between Xi and Trump on September 24.

“The legitimate question is why third countries should be expected to adopt Washington’s unilateral economic policy towards another sovereign state,” said Zichen Wang, deputy secretary-general of the Center for China and Globalization (CCG) think tank in Beijing.

“That does not, however, mean that Beijing will provide Tehran with a blank cheque,” Wang said.

“China is likely to continue opposing US secondary sanctions politically and to defend what it considers legitimate Chinese commercial interests. But past behaviour also shows that major Chinese banks and state-owned companies are highly conscious of sanctions exposure.”

Even as Beijing and Tehran have forged closer ties, their relations have for years been marked by a substantial gap between rhetoric and reality.

While China pledged to invest up to $400bn in Iran over 25 years as part of a “comprehensive strategic partnership agreement” signed in 2021, few projects have materialised amid what analysts say is Chinese firms’ reluctance to navigate sanctions and the opaque Iranian bureaucracy.

In 2023, Iran’s then deputy economy minister, Ali Fekri, complained that he was “not satisfied” with China’s level of investment since the agreement, saying it had only amounted to about $185m.

“Iranian experts often blame their government for not doing enough to attract Chinese investors or not pushing Chinese companies to share more technology,” said Leonardo Bruni, project manager at the ChinaMed Project.

“However, the reality is that there is no point for Chinese companies to give up their ties with the international financial system to expand their business in Iran,” Bruni said.

“It is much easier and more profitable to trade and invest elsewhere. Iran’s own domestic physical and bank infrastructure is also an obstacle.”

Meanwhile, the most tangible measure of China’s economic support, purchases of Iranian oil, has been dwindling amid the US blockade of Iranian ports.

Iranian crude exports via the Strait of Hormuz, mostly bound for China, fell from an estimated 1.85 million barrels per day (bpd) in March-April to just 240,000bpd in August, according to data from ship-tracking platform Kpler, though millions more barrels shipped before the blockade are still at sea.

In an interview with CNBC on Monday, US Treasury Secretary Scott Bessent said “only” about 30 million barrels of Iranian oil remained on the water and Chinese remittances to Iran were “going to run out”.

Kpler last month estimated that about 80 million barrels were in on-water shortage, enough to provide revenues to Tehran for up to six months.

“For China, Iran is valuable – but replaceable across many dimensions. Iranian oil matters, but China can obtain energy from Saudi Arabia, Russia, Iraq, the UAE, and numerous other suppliers,” said Mordechai Chaziza, an expert on China’s Middle East policy who lectures at Ashkelon Academic College in Israel.

“Iran offers geopolitical access, but China possesses relationships throughout the region. Iran supports China’s multipolar agenda, but so do many other states.”

China’s support for Iran is also not risk-free for Beijing, given its important relationships with Iranian rivals such as Saudi Arabia and the United Arab Emirates, Chaziza said.

“Saudi Arabia and the UAE are major energy and commercial partners.

“Gulf stability is vital because China obtains roughly half of its crude imports from the Middle East,” he added.

The “ideal outcome” for Beijing, Chaziza said, would be “a stable, sovereign, economically connected, and internationally non-Western” Iran, but not one “whose confrontation with Washington, Israel, or the Gulf monarchies forces China to choose sides”.

Wang, at the CCG, said that while Beijing appears determined to defend Chinese commercial interests, it is unlikely to sacrifice its broader interests in the region or elsewhere.

Beijing’s warning that it is ready to take countermeasures against unilateral sanctions is “not the same thing as promising to underwrite the Iranian economy”, Wang added.

For China, Iran is seen more as a customer than an ally, said Kerri Bitsoff, a former senior official at the US Treasury’s Office of Foreign Assets Control.

“I don’t think this is the alliance some people think it is, even though there’s real support. I think of a more like a customer relationship that Iran can’t walk away from,” Bitsoff said.

“And it was good for China – they got cheap oil, they got a US tied up in the Middle East, but I think that only lasts up until the point where it threatens China’s other interests,” she added.