In a 2015 summit faceoff in Washington, Chinese President Xi Jinping and Barack Obama promised to cease all cyber economic espionage. For a while Chinese hacking fell but it rose again with Donald Trump’s Presidency, as we learned Thursday with a Justice Department indictment against two Chinese hackers associated with Beijing’s Ministry of State Security (MSS).

Justice accused Zhu Hua and Zhang Shilong of infiltrating computer systems in what U.S. officials called “global computer intrusion campaigns.” The two men were allegedly...