On May 21, as U.K. Defense Secretary John Healey was flying back home from Estonia, the plane’s satellite signal was jammed —likely by Russia—for the duration of the flight. All around the Baltic Sea region, interference with navigation in shipping and aviation has become a persistent problem. Now, this subversive activity is growing fast in the Middle East, too. Healey and his team had barely boarded their Royal Air Force plane after visiting British troops in Estonia when the signal was