Proof?
Who attacks another country by releasing it in their own country first?
A country that has 1.2 billion and isn’t afraid to lose a few million for the sake of world domination
I’ve studied bio defense for years.
The correct distribution tool for a contagious virus is an infected human. Of which China has plenty of raw material.
High altitude dispersal is a ridiculous idea.
These balloons or whatever else they are sending are evidence of hostile intent and stopping them is important - but they are a very, very unlikely means of biological attack.