While both China and Iran have good reasons to suspect the US of being behind any harm done them, Iran more so, China may be desperate to distract folks from the very high likelihood it has made and released this virus. Many researchers have noted the multiple escapes from it's labs that occurred when it was studying SARS, and warned against siting a BSL-4 lab not only in China, but in the heart of Wuhan.

The Chinese government's own scientists themselves published a paper noting the virus was very likely to have originated in the Wuhan Institute of Virology, and even China's notorious censors have been unable to reduce the incidence of accusations it has made and lost control of SARS2.

Here's a post I made recently discussing some of that evidence, and one researcher, Shi Zhengli, whose particularly liable to have been the creator, or one of the creators, of this pathogen.

The bare fact is that China was adding functions to SARS-like bat coronaviruses that are features of this pathogen in the Wuhan Institute of Virology, where the pandemic first erupted, and has a history of accidental release of SARS viruses from it's labs conducting that research.

Iran may have some reasonable claim that it's suffering is being inflicted on it by a foreign power, and strong reason to point a finger at the US due to the malice provably shown by the US to Iran, but China doesn't have any reason to point at any nation but itself - except to redirect incessant claims it made and released this pathogen.