[0] https://en.wikipedia.org/wiki/Special_Counsel_investigation_...
Assange had a TV show on Russian State television in 2012.
Russia gave him asylum, for reasons which are not related to him helping them, purely because it antagonises the US.
He still openly criticised the Russian government, and has expressed strong desire to come back to the US.
I don't personally think either of these people are or have ever knowingly been Russian assets.
But that's not the point. Particularly after the Special Counsel investigation, Assange/Wikileaks has been portrayed quite publicly through a credible federal investigation as being used as a puppet for distributing Russian-acquired documents.
Snowden clearly ended up in Russia for lack of options when fleeing HK. There's never been any credible allegations of a Russian affiliation outside of that AFAIK.