I can't vouch for the source, but this provides a factual chronology of Yandex's (forced) integration into Russian state propaganda:
https://www.zois-berlin.de/en/publications/zois-spotlight/th...
https://www.zois-berlin.de/en/publications/zois-spotlight/th...
I'd say propaganda is often necessary, and usually successful, at allowing governments to execute war crimes. I think most modern war crimes are lied out of existence by propaganda outlets like Yandex (or any number of US news outlets at other points in recent history).