Re: Soviet Union Military Records #russia
These sites were created by Ministry of Defense of the Russian Federation, long after dissolution of the Soviet Union.
I recommend using https://pamyat-naroda.ru/ as a primary site, while also checking the 2 you mention. It brings in information from more sources. For example, there is only one result for my ggfather in OBD, but 3 results in Pamyat Naroda.
https://foto.pamyat-naroda.ru/ is a site that allows submission of photos and creation of a profile with the biography and links to the documents at https://pamyat-naroda.ru/.
Ministry of Defense also created a WWI site, where among various documents you can locate information about wounded, missing, pow, killed, and awarded soldiers. https://gwar.mil.ru/
If you navigate to any of these sites, there are links to all sites mentioned in this thread at the bottom of the page.