Only one nation group ( the British Commonwealth) was an combatant during the entire six years of WWII (September 1939 to September 1945) : even the original aggressor, Germany, ceased to be a combatant with its surrender early in 1945.
Every other nation on Earth - bar none - was neutral in the battle against Hitler and the Nazi Evil : for some, most or all of World War Two.
The sad fact is that most of the world's independent nations 'dog-danced' around the greatest moral crisis Humanity has ever faced.