At the end of last week, Japan gave up trying to get the United Nations Security Council to pass a binding resolution sanctioning North Korea for its April 5 missile launch. Instead, Tokyo accepted a watered-down statement from the Security Council’s president. Last-minute wavering from the Obama administration did not help Japanese efforts, but the main obstacle to firm U.N. action was concerted opposition from veto-wielding Beijing and Moscow. China and Russia have been busy lately. Last Wednesday, the Wall Street Journal reported that Chinese and Russians hackers have been penetrating the computer networks that operate the American power grid, with the apparent intention of attacking that grid at later dates. During the G-20 summit earlier this month, the...