Stink bugs have propogated their way across the USA in the last 5-7 years, and there's a variety of other bugs, fish, crustaceans, and even rodents that are prevalent that simply didn't exist here a decade or two or three ago.
Obviously some are accidental stow aways in cargo ships etc, but all of them? Why not force your enemy to deal with a common plague that your country already has?
There were some bug drops on flight radar during early COVID days.
Entomological warfare.
But you have to wonder if China is slipped through the massive US protection apparatus, what is going on with that apparatus?
Sure seems like this whole thing is caused by the challenges of large civilization and the mismanagement of its growth, particularly pesticides. They spray pesticides over cities and farmland to kill certain life forms deemed problematic. But these pesticides have the side effect of giving people respiratory illness, flu, etc. So they make vaccines to try and engineer humans to live in these toxic conditions. Let this play out long enough and you've terraformed the planet for manmade, non-organic everything, where traditional organisms cannot survive without "inputs" from big tech. Nature spent millions of years getting things right, now some stupid businessmen, through academic institution recommendation (their own R&D actually), are going to play god and unravel that great work.
The truth would put 99% in the hospital