You expect the Russians to strip search the President of the United States to check for a listening device when they know that person will be in the room to hear whatever is said anyway, and the US to agree to that?
At which point they can tell that he wears a watch but not whether the watch is a recording device, and can't detect shielded devices that can record audio onto internal storage with no RF emissions, and still can't do anything if he remembers a phrase and asks for it to be translated later.