The Strategic Surprise of the Agreement between Beijing and Tehran and the Suggestion of a Six-Power Concert The agreement between Beijing and Tehran falls under the definition of strategic surprise , i.e., events that entirely appertain to the political realm and mark a change or an about-turn in the balance among the powers. New alliances, the breakdown of alliances, the overturning of coalitions, diplomatic openings or unexpected military sorties: these are the regular novelties of international politics that Arrigo Cervetto wrote about. However, if the agreement was an unforeseeable event in itself, the long-term objective economic and political trends. that have determined it and made it possible are entirely investigable. The invasion of Afghanistan by the USSR at the end of December 1979 was interpreted by the United States as a potential threat to the oil routes of the Persian Gulf, and it was a contemporary revival of the Great Game , which had set the British Empire agai...