Milton Leitenberg, a biochemist and senior research associate with the Centre for International and Security Studies at the University of Maryland, said the suspicions China raises about Fort Detrick ignore the base’s past transparency. [—]
Then in 1991, Washington agreed to allow a Soviet team to visit any facilities of their choosing in the US to check the Americans complied with the Biological Weapons Convention of 1973 to destroy offensive biological weaponry, he said.
Note: the Soviets did not comply.
Also in the 1990s, several Chinese scientists spent extended periods working at Fort Detrick, according to Leitenberg, who has researched arms control for over 50 years and authored several books on the subject, including biological weapons
China’s targeting of Fort Detrick was a “classic authoritarian tactic” and comes out of Russia’s disinformation playbook, said Koblentz, who briefed the UN Security Council in 2016 on the threat of bioterrorism.
I would recommend reading the Dead Hand by David Hoffman to understand how the Soviet Union, in its paranoia, went full on with a BW program just after signing the Biological and Toxin Weapons Convention (BTWC) in 1972 (binding 1975)