As China hits back at 'ridiculous' Joe Biden comments on Xi Jinping, bilateral ties too feeble to weaken further, analysts say

A war of words shortly after US Secretary of State Antony Blinken's crucial fence-mending visit to China is further proof of Washington's inability to "walk the talk", though it is hardly possible for bilateral ties to fall any lower, analysts said.

This came as US President Joe Biden took aim at Chinese President Xi Jinping, in bringing up the stand-off over an alleged Chinese "spy balloon" that had prompted Blinken to postpone his planned visit in February.

"The reason why [Chinese President] Xi Jinping got very upset, in terms of when I shot that balloon down with two box cars full of spy equipment in it, was he didn't know it was there," Biden - who is seeking re-election - told a fundraising event in California on Tuesday.

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"That's a great embarrassment for dictators, when they didn't know what happened."

The US military shot down the balloon, which China said was a weather-monitoring vehicle caught up in a "force majeure accident", on February 4 - days after it had drifted into American airspace.

The Chinese foreign ministry hit back swiftly at Biden's remarks, calling them a "political provocation".

"The relevant remarks by the US side are extremely ridiculous and irresponsible, they seriously violate basic facts, diplomatic protocol and China's political dignity," ministry spokeswoman Mao Ning said.

Biden's comments came just a day after Blinken's audience with Xi in Beijing, and the same day US channel MSNBC broadcast an interview with the top American diplomat, where he said "that [balloon] chapter should be closed" as long as the incident was not repeated.

It was not immediately clear if the latest exchange would compromise the prospects of a Biden-Xi meeting at the next Asia-Pacific Economic Cooperation (Apec) summit in San Francisco this November.

However, analysts said Biden's remarks were unlikely to worsen the already poor bilateral relations, given China's low expectations for things to improve over the remainder of Biden's term.

According to Koh King Kee, founder and president of East West Bridge, an academic network of international relations scholars, little political trust remains between the two sides.

"Beijing has no fantasies about China-US relations under Biden, but is willing to keep channels of communication open and jointly build a 'guardrail' to avoid misjudgment by both sides that may end up in any untoward incidents," Koh said.