Well, no, it's not really possible to just do that using actors and sets, it would have been done during the Cold War otherwise. Up until recent advances of digital technology it wasn't really possible to have an actor convincingly fake someone else - e.g. a foreign politician - so that it's not easily detectable; this is a recent new ability (and even now you'd still want to use a good actor with a similar face shape and skill to match the body movement style in order to make a convincing deepfake).