“How could you possibly allow the election of a citizen of a socialist country as pope?!?" - Yuri Andropov, then head of the KGB 
In the tumultuous events of World War III, perhaps the most tumultuous was the so-called "Polish Summer" of 1982. While short-lived, largely the result of the brutal Soviet reprisals upon Poland, the Polish uprising of that hot August caused a great deal of chaos within Pact ranks while it existed.
It is now known that the cause for this revolt, also known as the 'Stanislaw Uprising", was the attempted KGB assassination of Pope John Paul II. While initially blamed upon a Turkish "lone wolf", evidence quickly mounted to the contrary conclusion: that this attempt on the pontiff's life was a tightly-controlled "wet op" locally orchestrated from within the Bulgarian embassy in Italy, specifically by Bulgarian military attaché Zilo Vassilev, but most definitely managed by the KGB from afar. It is now believed that the Soviets felt such drastic action was necessary because as early as 1979 the USSR was preparing for their assault upon Western Europe and knew that Pope John Paul would staunchly oppose any such aggression, possibly even to the point of converting the Polish Solidarity movement into a fifth column. He simply had to go.