By the late 2020s, nations globally were mired in numerous ‘diplomatic’ escalations. Military skirmishes sprang up regularly between countries and alliances. Countries which were allies on some issues were in conflict on others. Inexplicably, academics advised that the ‘best course of action’ was for all nations to openly declare World War 3. And quite incredibly, they were right. All military actions were put on hold while politicians tried to pass various motions in parliament.
Recognizing its value, nations maintain the impasse to this day, with regular rounds of expensive summits. But no actual fighting.