(July 14), Xinhai, September 3, 1971, signed an agreement on the question of West Berlin. Reference March 1970, the four countries of the Soviet Union, the United States, Britain, France, Berlin negotiations. September 3, 1971, signed an agreement on the question of West Berlin, West Berlin Agreement ". The main contents are: to reaffirm the rights and responsibilities of the United States, Britain, France and West Berlin; civilians in Western countries and cross-border traffic of goods through West Berlin channels will be smooth; West Berlin is not a part of the Federal Republic of Germany, the future is not the case of federal people of West Berlin can access for humanitarian, family, religious and commercial reasons or traveler identity to the German Democratic Republic; Federal Republic of Germany in the interests of international organizations and international conferences on behalf of West Berlin, Germany jurisdiction; In the Agreement Kam Order Berlin, the situation stabilized.