President Biden’s visit to Saudi Arabia this week is unlikely to bring any significant diplomatic breakthroughs — whether or not he decides to shake hands with Crown Prince Mohammed bin Salman (who, according to a CIA assessment, ordered the murder of Post contributing columnist Jamal Khashoggi). The Saudi regime almost certainly won’t make any human rights concessions. Nor will it make promises to help stabilize world energy markets, even though Biden cites this as a key reason he’s traveling to Jiddah in the first place.