There's another war pairing: Japan and Russia.
Japan kicked Russia's ass back in the 1800's. Totally sunk the Russian navy. It was really impressive for such a small country. Then the UN got together, looked at Japan, and said, "Knock that sh*t off".
So Japan did. Until it teamed up with Germany in WWII.
Then the US was all
Check this out, Japan! I made a nuke!" "BOOM" "HAHAHAHA!!"
And Japan was like "WTF, America?"
Then the US said, "Oooh, back-sassin', eh? Have another! *BOOM* So much for Nagasaki! HAHAHA"
And Japan started to cry bitterly as he went back to his rice field.
Then Russia cocked an eye at the US.
US was all, "Watchoo lookin' at, Russia? Eh? Comrade? Lawlz"
Then Russia's like "Hey, that's neat. I'll make one, too".
America soon shut up and said, "What? No, you can't d-"
"Oh look, I made one!"
"OH SH-"
And thus the Cold War Arms race started
There's also China and Japan over Manchuria, too.
On a serious note, my boyfriend's Latvian and escaped to Israel when the Soviet Union collapsed. It was pretty crazy what happened in that li'l Baltic country over there. I guess he had a banana in his stocking for Christmas, and his neighbors were seriously impressed.