In Berlin, Germany and Japan sign the Anti-Comintern Pact, agreeing to consult on measures "to safeguard their common interests" in the case of an unprovoked attack by the Soviet Union against either nation. The pact is renewed on the same day five years later with additional signatories.

The Anti-Comintern Pact (German: Antikominternpakt; Italian: Patto anticomintern; Japanese: , Bky kytei), officially the Agreement against the Communist International (German: Abkommen gegen die Kommunistische Internationale; Japanese: Kysan "intnashonaru" ni taisuru kytei ()) was an anti-Communist pact concluded between Nazi Germany and the Empire of Japan on 25 November 1936 and was directed against the Communist International (Comintern). It was signed by German ambassador-at-large Joachim von Ribbentrop and Japanese ambassador to Germany Kintomo Mushanokji.:188189 Italy joined in 1937, but it was legally recognised as an original signatory by the terms of her entry. Spain and Hungary joined in 1939. Other countries joined during World War II.:49The Japanese signatories had hoped that the Anti-Comintern Pact would effectively be an alliance against the Soviet Union, which is certainly how the Soviets perceived it.:226 There was also a secret additional protocol which specified a joint German-Japanese policy specifically aimed against the Soviet Union.:188189:197 However, after the accession of Fascist Italy to the pact and especially the German-Soviet rapprochement after the MolotovRibbentrop Pact, it gained an increasingly anti-Western and anti-British identity as well.:44:13After August 1939, Japan distanced itself from Germany as a result of the Molotov-Ribbentrop Pact.:24:40 The Anti-Comintern Pact was followed by the September 1940 Tripartite Pact, which identified the United States as the primary threat rather than the Soviet Union, however by December 1941 this too was virtually inoperative. The Anti-Comintern Pact was subsequently renewed in November 1941 and saw the entry of several new members into the pact.:49 The Nazi regime saw signing of the Anti-Comintern Pact as a "litmus test of loyalty".The Anti-Comintern Pact ceased to exist with the end of World War II.

Berlin ( bur-LIN, German: [bɛʁˈliːn] (listen)) is the capital and largest city of Germany by both area and population. Its 3.7 million inhabitants make it the European Union's most populous city, according to population within city limits. One of Germany's sixteen constituent states, Berlin is surrounded by the State of Brandenburg and contiguous with Potsdam, Brandenburg's capital. Berlin's urban area, which has a population of around 4.5 million, is the second most populous urban area in Germany after the Ruhr. The Berlin-Brandenburg capital region has over six million inhabitants and is Germany's third-largest metropolitan region after the Rhine-Ruhr and Rhine-Main regions.Berlin straddles the banks of the Spree, which flows into the Havel (a tributary of the Elbe) in the western borough of Spandau. Among the city's main topographical features are the many lakes in the western and southeastern boroughs formed by the Spree, Havel and Dahme, the largest of which is Lake Müggelsee. Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. About one-third of the city's area is composed of forests, parks, gardens, rivers, canals and lakes. The city lies in the Central German dialect area, the Berlin dialect being a variant of the Lusatian-New Marchian dialects.

First documented in the 13th century and at the crossing of two important historic trade routes, Berlin became the capital of the Margraviate of Brandenburg (1417–1701), the Kingdom of Prussia (1701–1918), the German Empire (1871–1918), the Weimar Republic (1919–1933), and Nazi Germany (1933–1945). Berlin in the 1920s was the third-largest municipality in the world. After World War II and its subsequent occupation by the victorious countries, the city was divided; West Berlin became a de facto exclave of West Germany, surrounded by the Berlin Wall (from August 1961 to November 1989) and East German territory. East Berlin was declared capital of East Germany, while Bonn became the West German capital. Following German reunification in 1990, Berlin once again became the capital of all of Germany.

Berlin is a world city of culture, politics, media and science. Its economy is based on high-tech firms and the service sector, encompassing a diverse range of creative industries, research facilities, media corporations and convention venues. Berlin serves as a continental hub for air and rail traffic and has a highly complex public transportation network. The metropolis is a popular tourist destination. Significant industries also include IT, pharmaceuticals, biomedical engineering, clean tech, biotechnology, construction and electronics.

Berlin is home to world-renowned universities such as the Humboldt University, the Technical University, the Free University, the University of the Arts, ESMT Berlin, the Hertie School, and Bard College Berlin. Its Zoological Garden is the most visited zoo in Europe and one of the most popular worldwide. With Babelsberg being the world's first large-scale movie studio complex, Berlin is an increasingly popular location for international film productions. The city is well known for its festivals, diverse architecture, nightlife, contemporary arts and a very high quality of living. Since the 2000s Berlin has seen the emergence of a cosmopolitan entrepreneurial scene.Berlin contains three World Heritage Sites: Museum Island; the Palaces and Parks of Potsdam and Berlin; and the Berlin Modernism Housing Estates. Other landmarks include the Brandenburg Gate, the Reichstag building, Potsdamer Platz, the Memorial to the Murdered Jews of Europe, the Berlin Wall Memorial, the East Side Gallery, the Berlin Victory Column, Berlin Cathedral and the Berlin Television Tower, the tallest structure in Germany. Berlin has numerous museums, galleries, libraries, orchestras, and sporting events. These include the Old National Gallery, the Bode Museum, the Pergamon Museum, the German Historical Museum, the Jewish Museum Berlin, the Natural History Museum, the Humboldt Forum, the Berlin State Library, the Berlin State Opera, the Berlin Philharmonic and the Berlin Marathon.