Russia (Soviet Union) they where on the allies in WWI and WWII but they switched to communism and the united states started spying on them and the USA and Russia soon became enemies.
they had a common enemy germany
He was the enemy of the allied countries
Simply because they shared a common enemy.
The USSR
"Was enemy *your* enemy?" I guess that depends on what side you were on. Italy was allied with Germany, one of the "Axis" powers, fighting against the U.K., USSR, USA.
The allied armies marched upon the enemy camp.
Japan
He was the enemy of the allied countries
Enemy of who? The Allied or Axis Powers?
Germany and Japan
The main enemies of the Allied Nations in WW2 were Germany, Japan and Italy. There were some other Axis nations, but, they were very small.
Germany was a part of the Axis Powers (or Nations) during World War II. Italy and Japan were also associated with the Axis powers, though not necessary in direct alliance with Germany itself. Their common enemy, the Allied Powers, were what united them.