The common enemy of the Soviet Union was either the U.S.A. or the U.K.(mainly New England) They had many enemies but those 2 were there main threats
Because the US and USSR shared a common enemy. Germany invaded the USSR in June, 1941, and in December, 1941 Germany declared war on the US. My enemy's enemy is my friend.
USSR. During WWII the USSR and USA were allied. However after the war there was a build up of arms between the two countries in what became the Cold War.
The USSR
US: 1945. USSR: 1949
Both the US & USSR begin with letters US. Both the US & USSR used a star on all of their war machines (Ships, Tanks, Aircraft, Trucks, Artillery, etc.). Both the US & USSR extended from the Pacific Ocean to the Atlantic Ocean. Both the US & USSR had sub-states within it. Both the US & USSR had minority populations of people & cultures. Both the US & USSR had fairly matched technologies. Both the US & USSR were spawned from revolutions (1776) & (1917) respectively. Both the US & USSR had frontier expansions: The US went West; the USSR went East.
Because the US and USSR shared a common enemy. Germany invaded the USSR in June, 1941, and in December, 1941 Germany declared war on the US. My enemy's enemy is my friend.
Germany was in WW2
The USSR
The US was the western enemy or competitor to the USSR during the Cold War. The US had to dedicate a lot of resources in research and development of military defense and offense technology to stay ahead of the USSR in military supremacy.
USSR. During WWII the USSR and USA were allied. However after the war there was a build up of arms between the two countries in what became the Cold War.
USSR
US: 1945. USSR: 1949
The USSR
Both the US & USSR begin with letters US. Both the US & USSR used a star on all of their war machines (Ships, Tanks, Aircraft, Trucks, Artillery, etc.). Both the US & USSR extended from the Pacific Ocean to the Atlantic Ocean. Both the US & USSR had sub-states within it. Both the US & USSR had minority populations of people & cultures. Both the US & USSR had fairly matched technologies. Both the US & USSR were spawned from revolutions (1776) & (1917) respectively. Both the US & USSR had frontier expansions: The US went West; the USSR went East.
It was merely a case of "my enemy is your enemy so we must be allies". The reason why Britain allied with the Russians was it was a major power and needed their help to make sure that Germany would lose the war, however they never truly trusted them. Also, the US become allies with the USSR as it was allies with Britain. In addition to this the US knew that if the USSR allied with Germany, they wouldn't stand a chance and the outcome of the war would be different.
Hitlers last offensive against the western allies (Russia (USSR) was Germany's primary enemy and was an Eastern enemy of Germany).
Because Germany was the common enemy of the Soviet Union, the US and the free French and Poles. The USSR was at peace with Japan until the final months of WWII.