Significantly-less-than-totally-cordial/peaceable feelings among two or more different countries, wherein da leaders and/or citizens of said empires are snapping and grinding their teeth in suppressed rage at da perceived unfairnesses and/or idiocies of their neighboring territories' populations.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.