In times of war who should Muslims support

This may be a controversial question but as Muslims we should be ready face difficult questions. Now it is a fact that Islam doesn't believe in race or nation state. A muslim is a muslim he is equal no matter where he is from, no matter if he is black or brown. Islam means equality and it encourages unbreakable brotherhood among Muslims.

For a Muslim the "Ummah" is bigger than man made boundaries. Muslim Ummah refers to the unity of Muslims all over the world. It means the whole community of Muslims bound together by ties of religion.

So for example you live in a Non-muslim country and it  goes to war with an Islamic country then who should Muslims side with ? Its a difficult question and it depends on the situation. If that Islamic country is following true islam and it believes in Muslim ummah, brotherhood and equality then Muslims must support their brothers on the other hand if its an extremist organization like ISIS then Muslims must oppose it and not help them.