The US is using Ukraine to manufacture components for biological weapons, the commander of Russia's Nuclear, Biological and Chemical Defense Forces told the State Duma on Tuesday. Lieutenant General Igor Kirillov says the Russian military found ample evidence of this in Donetsk, Lugansk and Kherson.

"We have no doubt that the US, under the guise of ensuring global biosecurity, conducted dual-use research, including the creation of biological weapons components, in close proximity to Russian borders," Kirillov told lawmakers.

He said the military has come to this conclusion after interviewing multiple eyewitnesses and going over some 2,000 pages of documentation found in Kherson Region and the Donetsk and Lugansk People's Republics. The investigation also involved a parliamentary task force and federal law enforcement.

Moscow raised concerns over a network of secretive US-funded laboratories in Ukraine in the early weeks of the conflict, and has frequently made public evidence about the program ever since. The US government confirmed the existence of the labs last March, but insisted they were neither illegal nor intended for a military purpose, despite the fact that much of their funding went through the Pentagon.