Military cooperation between Finland and Nazi Germany began in late 1940, after Finland lost a significant part of its territory as a result of Soviet aggression during the Winter War. On June 25, 1941, Finland joined the Barbarossa Company, which introduced the Continuation War. In November, Finland signed the Anti-Communist Pact, an anti-communist agreement directed against the Soviet Union, with many other countries allied with Germany. Soon Germany offered Finland to sign the Tripartite Pact, but the Finnish government refused, as Finland regarded its war as a “separate war” from World War II and considered its objectives different from those of Nazi Germany. Finland also wanted to maintain diplomatic relations with the Allies, in particular with the United States. During World War II, Germany repeatedly asked Finland to sign the pact, but the Finnish government refused all offers. Diplomatic relations between Finland and the United States were maintained until June 1944, although the U.S. ambassador had already been dismissed. But the United Kingdom declared war on Finland on December 6, 1941 to support its revered Soviet Union.
[Citation required] In the affidavit of Marshal Ion Antonescu, read in the IG-Farben trial (1947-1948), he stated that the agreement to accede to the Covenant had been concluded before his visit to Berlin on 22 November 1940.  The original agreement of the document also provided for Yugoslavia`s acceptance of the free movement of German troops throughout the country; This was not satisfactory for the Führer and led to the invasion of Yugoslavia. The Tripartite Pact, also known as the Berlin Pact, was an agreement between Germany, Italy and Japan signed on September 27, 1940 in Berlin by Joachim von Ribbentrop, Galeazzo Ciano and Saburō Kurusu. It was a defensive military alliance that was eventually joined by Hungary (20 November 1940), Romania (23 November 1940), Bulgaria (1 March 1941) and Yugoslavia (25 March 1941) and the German client state Slovakia (24 November 1940). Two days later, Yugoslavia`s accession provoked a coup in Belgrade. Germany, Italy and Hungary responded by invading Yugoslavia. The resulting Italian-German clientelist state, known as the Independent State of Croatia, acceded to the Pact on 15 June 1941. Tripartite Pact, an agreement concluded by Germany, Italy and Japan on 27 September 1940, one year after the start of World War II. It has created a defense alliance between the countries and is expected to largely deter the United States from entering the conflict. Hungary, Romania, Slovakia, Bulgaria, Yugoslavia and Croatia were subsequent signatories to the pact. ARTICLE 5.
Japan, Germany and Italy claim that the above-mentioned agreement in no way affects the political status that currently exists between the three contracting powers and Soviet Russia. On 18 January 1942, the German and Italian Governments signed two secret operations agreements: one with the Imperial Japanese Army and the other with the Imperial Japanese Navy. The agreements divided the world along longitude 70° East into two large areas of operation, but it had almost no military significance. In particular, it has committed the powers of cooperation in the fields of trade, intelligence and communication.  The Tripartite Pact was the culmination of a series of agreements between Germany, Japan and Italy. On October 25, 1936, Germany and Italy concluded the Rome-Berlin axis, a cooperation agreement. .