Question: When did the country the top-ranking Warsaw Pact operatives came from, despite it being headquartered in the country where A Generation is set, agree to a unified Germany inside NATO?

Passages:
"A Generation" is set in Wola, a working-class section of Warsaw, in 1942 and tells the stories of two young men at odds with the Germans occupation of Poland. The young protagonist, Stach (Tadeusz Łomnicki), is living in squalor on the outskirts of the city and carrying out wayward acts of theft and rebellion. After a friend is killed attempting to heist coal from a German supply train, he finds work as an apprentice at a furniture workshop, where he becomes involved in an underground communist resistance cell guided first by a friendly journeyman there who in turn introduces Stach to the beautiful Dorota (Urszula Modrzyńska). An outsider, Jasio Krone (Tadeusz Janczar), the temperamental son of an elderly veteran, is initially reluctant to join the struggle but finally commits himself, running relief operations in the Jewish ghetto during the uprising there. The Warsaw Treaty's organization was two-fold: the Political Consultative Committee handled political matters, and the Combined Command of Pact Armed Forces controlled the assigned multi-national forces, with headquarters in Warsaw, Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. Therefore, although ostensibly an international collective security alliance, the USSR dominated the Warsaw Treaty armed forces. Horst Teltschik, Kohl's foreign policy advisor, later recalled that Germany would have paid ``100 billion deutschmarks ''if the Soviets demanded it. The USSR did not make such great demands, however, with Gorbachev stating in February 1990 that`` The Germans must decide for themselves what path they choose to follow''. In May 1990 he repeated his remark in the context of NATO membership while meeting Bush, amazing both the Americans and Germans. This removed the last significant roadblock to Germany being free to choose its international alignments, though Kohl made no secret that he intended for the reunified Germany to inherit West Germany's seats in NATO and the EC.

Supporting sentences:
"A Generation" is set in Wola, a working-class section of Warsaw, in 1942 and tells the stories of two young men at odds with the Germans occupation of Poland. Furthermore, the Supreme Commander of the Unified Armed Forces of the Warsaw Treaty Organization which commands and controls all the military forces of the member countries was also a First Deputy Minister of Defense of the USSR, and the Chief of Combined Staff of the Unified Armed Forces of the Warsaw Treaty Organization was also a First Deputy Chief of the General Staff of the Armed Forces of the USSR. In May 1990 he repeated his remark in the context of NATO membership while meeting Bush, amazing both the Americans and Germans.