We even bought a large quantity of plutonium from Russia for the same reason and helped them to make sure their nukes were secure after the Soviet Union collapsed.
A lot of this work was done through the International Science and Technology Center, funded mainly by the EU, US and Japan.
You can view their annual reports here: https://www.istc.int/view-reports
Cool story bro...but there have been multiple deadly outbreaks near these US funded "research" facilities in recent years, and it doesn't take three decades years to clean up old Soviet laboratories. Also, the arch neo-liberal Victoria Nuland spilled the beans about these labs recently while testifying before the Senate Intelligence committee, and the Russians have shared incriminating documents they gained access to in Ukraine...so spare us the hasbara.