Who is the source on "Serbia selling weapon to Ukraine" in the same "leak" then? The Russians or the Serbians?
Wasn't the US first said China sold lethal weapons to Russia, then said there is no evident? Seriously, the US is basically saying white is and is not black at the same time, and think that can somehow confuse people?
US behaviour has become a laughing stock. Disinformation is to make enemy believing something, doubt something, unsure of anything. However I think they have tried too hard that more and more people (me included) choose not to take their "leak" with any value. If we want to know something, just do our own study, ignore the US.