The enemy of my enemy is my friend

"The enemy of my enemy is my friend" is an ancient proverb which suggests that two parties can or should work together against a common enemy. The exact meaning of the modern phrase was first expressed in the Latin phrase "Amicus meus, inimicus inimici mei" ("my friend, the enemy of my enemy"), which had become common throughout Europe by the early 18th century, while the first recorded use of the current English version came in 1884. A Sanskrit treatise on statecraft, the Arthashastra of Kautilya states: The king who is situated anywhere immediately on the circumference of the conqueror's territory is termed the enemy.The king who is likewise situated close to the enemy, but separated from the conqueror only by the enemy, is termed the friend (of the conqueror). A neighboring power would be the first to dispute control of territory, and therefore Kautilya finds neighboring kings to be natural enemies of any conqueror. A king whose territories border those of the enemy would also have this relationship with them, and therefore be a natural ally. This system of relationships was termed Rajamandala (meaning circle of kings) and informed the foreign policy of Chandragupta's Empire. This early theory of geopolitics is still recognized today as the Mandala theory of foreign relations. The idea that "the enemy of my enemy is my friend" functioned in various guises as foreign policy by the Allies during World War II. In Europe, tension was common between the Western Allies and the Soviet Union. Despite their inherent differences, they recognized a need to work together to meet the threat of Nazi aggression under the leadership of Adolf Hitler. Both U.S. President Franklin D. Roosevelt and British Prime Minister Winston Churchill were wary of the Soviet Union under the leadership of Joseph Stalin. However, both developed policies with an understanding that Soviet cooperation was necessary for the Allied war effort to succeed. There is a quote from Winston Churchill made to his personal secretary John Colville on the eve of Germany's invasion of the Soviet Union (Operation Barbarossa).