LONDON — Bulgaria will not investigate suspected Russian electronic interference with a top European official's plane, officials said Monday — because this kind of GPS jamming is now so common. European Commission President Ursula von der Leyen was flying to Plovdiv, Bulgaria on Sunday when her plane was hit by GPS jamming. It landed safely but the disruption was the latest in a string of almost 80 incidents tracked by The Associated Press and blamed on Russia by Western officials since Moscow