If the Russians are to be believed, the U.S. had an extensive biological warfare effort going in Ukraine. The Russians want to present their evidence and the U.S. keeps stonewalling, which indicates that perhaps the Russians should be believed. From the transcript of an interview Maria Zakharova at thesaker.is:
Foreign Ministry Spokesperson Maria Zakharova’s interview with “RT” TV Channel, Moscow, April 16, 2022
Question: It became known that during the special military operation in Ukraine, Russian troops discovered new documents on military biological activities in Ukraine. Can you talk about this in more detail?
Maria Zakharova: As a result of the Special Military Operation in Ukraine (SMO), Russia’s Armed Forces found documents that shed some light on the bio-military programme implemented by the US Defence Department in Ukraine. The researchers in the programme were studying the most dangerous pathogens – potential biological agents for biological weapons that have natural focuses in both Ukraine and Russia. They were also researching ways that epidemics spread based on these agents. The scale of work makes it obvious that a considerable, and probably the most important, part of the information on the American military programme remains concealed from the international community.
Speaking at a US Senate Committee on Foreign Relations hearing on March 9, 2022, Undersecretary of State for Political Affairs, Victoria Nuland, said Washington was trying to prevent the transfer of some research materials from Ukrainian bio-laboratories to Russian forces. During press briefings on March 7, 10, 17, 24 and 31, Chief of the Russian Armed Forces’ Radiation, Chemical and Biological Defence Forces Igor Kirillov described the US bio-military activities in Ukraine, based on the information obtained during the SMO in Ukraine by the Armed Forces of Russia. He also set forth conclusions based on expert analysis. Researchers continue to study these materials.