The treaty of versailles was set up by the british parliment and it included harsh terms which caused germans to feel outcheated their territory and they were worrying about the effect of the repayment on their economy. It was the main cause of all tensions in Europe
Probably (3) Both communist...
..considering the economies of the two nations (almost non-existent) based upon internal market or upon trade with the "mother" communist nations (URSS for East Germany and China for North Korea).
Russia has part of its roots in European culture where the ideas of goodness, honor, and freedom are understood as in the West. The Viking raiders came from the North. Traders from Scandinavia also settled. They became the rulers of Rus, the city-principality of Kiev and forerunner of the Russian state. The other part of Russia has Asian roots. The Mongols, [Tartars] conquered Moscow in 1234 and Kiev in 1240, and ruled with despotism, invaders unstoppable, making Russians their slaves. Russian blood is a mixture of Slavic, Finnish, and Tatar. Kievan Rus had converted to Orthodox Christianity in 988. When Moscow liberated itself from the Tartar yoke in 1480, the modern Russian state was born. Distant from Europe, the new state was cut off from Constantinople which in 1453 had fallen to the Muslim Ottoman Turks.
Oil played a big part in the military and simply economic plans of each country. Japan entered through that specifically but also Japan for some time felt as though they were treated as a “little country” they wanted to be a world power so the best way to get to that is a booming economy and bolstered military. At that time the U.S. supplied Japan with a majority of it’s fuel. As did the U.S. to Germany but when the U.S. entered the war it was very much a moral cause but at the same time it was over resources. Germany, Japan, and the U.S. shortly before the war had a time of great economic gains.