With Kharg Island, Iran’s main oil-export terminal, in flames after Saturday’s US-led attack, China’s energy lifeline is going up in smoke.

Ignoring international sanctions, oil-thirsty China had long been the Ayatollah Khamenei regime’s main buyer.

To be sure, China was a cheap customer, paying well below the going market price for Iran’s bootleg oil.

Not only that, it insisted in paying in Chinese yuan, not dollars, ensuring the money would flow back to China.

Beijing’s slick sales pitches convinced the Iranians to spend their oil billions buying China’s military and telecommunications equipment — like the “state-of-the-art” radar systems that now lie in smoldering ruins after failing to detect the incoming American air strikes.

But the decapitation of Iran’s leadership and the destruction of its Chinese-made defense arsenal aren’t the worst of Beijing’s Middle East woes.

Iran’s reckless missile barrages have united the entire region against it — causing an enormous loss of face for its chief international backer.

Two years ago, China was riding high in the Arab world.

In March 2023 it brokered a normalization agreement between Shiite Iran and its longtime Sunni adversary, Saudi Arabia.

Saudi Investment Minister Khalid Al-Falih praised the new Middle Eastern power broker.

A multipolar world had emerged, he declared — and cooperation between the Gulf states and China would be “a significant part of the new order.” A year into President Donald Trump’s second term, China’s role in that new order seems to be shrinking by the day.

It’s not just that Iran, the anchor of China’s Middle East ambitions, is now an international pariah.

That’s only the latest in a long series of recent geopolitical setbacks for America’s chief adversary.

China’s woes began soon after Trump returned to office, as his tariffs took a huge bite out of Beijing’s predatory trade profits.

Then Trump took aim at China’s inroads into Latin America, starting with the Panama Canal.

He put the government of Panama on notice: If it didn’t secure this vital strategic waterway, Trump would.

The Panamanian Supreme Court has just terminated the leases of the Chinese company running the Atlantic and Pacific ports, ending China’s ability to shut....