"Russia has a well-documented history of using chemical weapons and has long maintained a biological weapons program in violation of international law," Dalton said, adding, "Russia also has a track record of falsely accusing the West of the very violations that Russia itself is perpetrating.".
"This is exactly the kind of false flag effort we have warned Russia might initiate to justify a biological or chemical weapons attack," she said.
Washington had warned earlier this week that Russia could escalate the violence in its war in Ukraine with the use of biological or chemical weapons, or by claiming Ukrainian forces used them as a pretext.
White House press secretary Jen Psaki on Wednesday dismissed Russia's claims as "preposterous" and suggested Russia may be laying the groundwork for using such weapons itself.
"This is all an obvious ploy by Russia to try to try to justify its further premeditated, unprovoked, and unjustified attack on Ukraine.".
"We are not, not developing biological or chemical weapons inside Ukraine.
The Friday meeting will hear briefings from U.N. disarmament chief Izumi Nakamitsu and Under Secretary General Rosemary DiCarlo, a former U.S. Mission to the U.N. Ambassador-rank official. »