There is definitely something fishy going on in Ukraine with regards to bio-weapons. It is unclear what exactly is going on, and there is the potential that the US is setting Russia up for embarrassment when they say their purpose of the invasion is to remove chemical weapons from Ukraine and are unable to find evidence of such.
No chemical or biological weapons are being developed on the territory of Ukraine. As a citizen of Ukraine,<>
You can't possibly know that. Any chemical/biological weapons facilities are generally going to be kept secret, and wont be known to the general public.
You can literally say the same thing for any country in the world. The last thing anyone is going to publicly admit is "we have chemical/biological weapons facilities here." But, of course, that doesn't mean we should all be paranoid. That doesn't mean we should send hundreds of thousands of troops and invade their country and occupy it, using nuclear weapons to intimidate them into submission. That doesn't mean we should force their people to "buy in" to our authoritarian regime. That doesn't mean we should bomb their cities. That doesn't mean we should kill thousands of people. That doesn't mean we should wage all out war. However, that is exactly what is taking place in Ukraine right now.