Short answers, pulled from the story.
The Berlin Declaration 1945 was a document adopted by the four Allied Powers on the 5th of June 1945 that declared Germany had no government or central administration. It established a condominium of authority for the four Allied Representative Powers which later constituted the Allied Control Council.
Georgy Zhukov signed the declaration for the Soviet Union alongside Dwight D. Eisenhower for the United States, Bernard Montgomery represented the United Kingdom while Jean de Lattre de Tassigny signed for France. The four commanders each signed four copies of the declaration in English, French, Russian, and German as the press took photographs.
The council was established on the 30th of August 1945 to execute supreme governmental power over Allied-occupied Germany. In its initial proceedings the council assumed itself to be the sole repository of German state sovereignty especially in respect of external relations.
Zhukov refused to sign because Article 10 required Soviets to arrest Japanese nationals found in Germany since the USSR was not at war with Japan. This clause created a diplomatic impasse until Eisenhower ordered the removal of the clause surprising Zhukov who needed approval from Moscow.
The text maintained the continued existence of a German national people and territory defined on the 31st of December 1937. That date marked the period after the 1935 Saar referendum and before the 1938 Anschluss.