I assumed you need a thorough explanation, considering your statements like “Knowingly posting an untrustworthy source without any remark on its untrustworthiness implies that you believe that source.”. No, this is simply untrue. That’s not how it ever worked. Western media will happily relay Russian claims without adding disclaimers about trustworthiness of Russian media in each and every instance. The main reason to add disclaimers like these is to in fact signal allegiance to opposing side.