An eternal law of global affairs is that weakness invites aggression that can lead to war. The latest validation of this truth is that in the eighth year of the Obama Presidency the tide of war is building on multiple fronts and the U.S. can’t escape the consequences.

Start with the rumors of cyber war between the U.S. and Russia. Vice President Joe Biden said on “Meet the Press” Sunday that the U.S. plans to retaliate against Russia for its hacking into Democratic Party files “at the time of our choosing.” Such a hawkish...