The famed director went off on POTUS during a recent interview he did with Russell Brand -- who has tended to lean right in his political views these days. That was echoed in Oliver's diatribe ... where he accused Biden of being on the verge of starting World War III.

Check it out ... OS says Joe is repeating historical missteps with his foreign policy, especially as it relates to how he and his administration are dealing with the ongoing conflict.

He doesn't really get into specifics -- at least not in this lone clip -- but he seems to be alluding to the fact that the U.S. continues to support Ukraine through funding and weaponry ... which he seems to think is only further antagonizing Putin, maybe for the worse.

Stone also had this to say about having buyer's remorse on election night ... "I voted for him – I made a mistake, I was thinking he was an old man now that he would calm down, that he would be more mellow and so-forth, I didn’t see that at all. I see a man who maybe is not in charge of his own administration. Who knows."