As President Trump is warmly received on the world stage, it's not hard to think that Joe Biden back home is jealously stewing and thinking up ways he can throw a few number-twos into Trump's punch bowl ahead of his taking office. That's obvious enough in his response to President Trump's statement that the U.S. should stay out of Syria's civil war, particularly since the Russians and Iranians are on the run and will no longer be players. Biden instead decided to escalate U.S. involvement upon hearing that, with airstrikes and approximately 900 U.S. troops on the ground. Biden normally...