It's not very bright not to cite important claims. Here are some, there are others available. There is yet to be found a Russian-language equivalent:
The National Turk: Russia: Developing Biological Weapons
(A ridiculously complex URL, not worthy of transcribing)
Russia Has Documents Confirming That Biological Weapons Have Been Developed in Ukraine
Russia has Documents Confirming that Biological Weapons have Been Developed in Ukraine - ReporterJET developed-in-ukraine/
Russia Presents Evidence of Biological Weapons Development in Ukraine
detv.us
'....RIA Novosti.'
So now there is another possibility outside Lenta-ru for verifying the claim in the Russian language RIA Novosti.
europe-cities.com
'....Poltava and Kharkiv biological laboratories....'
Now we know two possible locations for the labs. Kharkiv is closest to Russia.
The National Turk: Russia: Developing Biological Weapons
(A ridiculously complex URL, not worthy of transcribing)
Russia Has Documents Confirming That Biological Weapons Have Been Developed in Ukraine
Russia has Documents Confirming that Biological Weapons have Been Developed in Ukraine - ReporterJET developed-in-ukraine/
Russia Presents Evidence of Biological Weapons Development in Ukraine

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The loudest and most important headlines from around the world!

So now there is another possibility outside Lenta-ru for verifying the claim in the Russian language RIA Novosti.

Russia announced the development of biological weapons in Ukraine

Now we know two possible locations for the labs. Kharkiv is closest to Russia.