The control of satellite nations and the making of nuclear weapons led to a cold war confrontation in this city.

The control of satellite nations and the making of nuclear weapons led to a Cold War confrontation in Berlin, Germany.

Explanation:

Berlin is the capital of the Federal Republic of Germany. It has around 3.6 million inhabitants, which make it the most populous city in Germany and the European Union.  

From 1949 the eastern part of the city was the capital of the German Democratic Republic (most commonly called East Germany, which was controlled by the Soviet Union). In turn, the western part of the city was in the hands of the democratic nations (France, Britain and the United States), but consisted of an enclave within communist territory. Since 1961, both parts of the city were divided by a wall, the famous Berlin Wall. With German reunification in 1990, Berlin became the capital of Germany again and subsequently the seat of the Federal Government.

a.) are both appointed for life