It’s been a three-nation European tour with a two-part message. On Monday, Chinese President Xi Jinping arrived in Paris, where he met with French President Emmanuel Macron and European Commission President Ursula von der Leyen to argue the point that engagement with China is a net good. Then, on Tuesday, came the postscript: Xi traveled to Serbia to mark the anniversary of the bombing of Belgrade’s Chinese Embassy in 1999 by five stray NATO rockets amid its occupation of Kosovo.