US warns China is considering arming Russia in Ukraine war: ‘That would cause a serious problem’

US intelligence suggests China is considering providing arms and ammunition to Russia, an involvement in the Kremlin’s war effort that would be a “serious problem,” secretary of state Antony Blinken said.

Mr Blinken said the US has long been concerned that China would provide weapons to Russia.

He pointed to Chinese leader Xi Jinping’s promise to Russian president Vladimir Putin of a partnership with “no limits” when they met just weeks before Putin sent his troops into Ukraine on 24 February last year.

Since then, ties between the two countries have only grown stronger.

“We’ve been watching this very, very closely,” Mr Blinken said in an interview that aired Sunday, a day after his meeting at a security conference in Munich with Wang Yi, the Chinese Communist Party’s most senior foreign policy official.

“And, for the most part, China has been engaged in providing rhetorical, political, diplomatic support to Russia, but we have information that gives us concern that they are considering providing lethal support to Russia in the war against Ukraine.

"It was important for me to share very clearly with Wang Yi that this would be a serious problem,” Mr Blinken said.

With the Russian president determined to show some progress on the battlefield as the war nears the one-year mark, Kremlin forces have been on the offensive in eastern Ukraine.

“The Ukrainians are holding very strong, the Russians are suffering horrific losses in this effort,” Mr Blinken said. He estimated that Russia has 97 per cent of its ground troops in Ukraine.

The Russians also are eager to capture more territory before Ukraine receives the more advanced weapons recently pledged by the US and its European allies.

“But what Secretary Blinken said is big news to me,” said Sen Lindsey Graham, adding that the world should “come down hard on China” if it provides lethal weapons to Russia.

“To the Chinese, if you jump on the Putin train now, you’re dumber than dirt,” he said.

“It would be like buying a ticket on the Titanic after you saw the movie. Don’t do this.”

Mr Graham said it would be the “most catastrophic thing that could happen to the US-China relationship. … That would change everything forever.”

Tensions between Washington and Beijing have been heightened in recent weeks after the US shot down what it says was a Chinese spy balloon. Beijing insists it was used mainly for meteorological research and was blown off course.

Linda Thomas-Greenfield, the US ambassador to the United Nations, also expressed her concern about any effort by the Chinese to arm Russia, saying "that would be a red line.”

Retired general Jack Keane, a former army vice chief of staff, said he agreed with the Biden administration’s decision to expose China’s possible readiness to provide some lethal weapons to Russia. He said it may persuade China to hold off.

“And I think coming out and exposing and I would go further and tell them what we think they are attempting to provide, China will pull back likely after that public exposure,” he said.