Russia has claimed, without evidence, that the United States is operating biowarfare laboratories in Ukraine.

The U.S. has dismissed the allegations as “preposterous,” and — along with NATO leaders — warned that the Kremlin might be seeking to manufacture a pretext for using chemical or biological weapons in its flailing military assault against its neighbor. Ukraine has previously said that, like many other countries, it has public-health laboratories dedicated to researching how to mitigate the threats of dangerous diseases affecting animals and humans.

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