What are the rules for Ramadan during war?

I sincerely hope this doesn’t turn into a pointless debate of the merits/demerits of the horrible war happening in Gaza. If you wish to debate that, there are other questions for that, and you can ask your own question.

I am genuinely interested to know if the rules of Ramadan change during war. I am not very knowledgeable about how Ramadan is observed other than with prayers and daytime fasting for adults.

I know starvation is widespread in Gaza at the moment, but perhaps someone knows whether ordinary fasting is suspended when war happens during Ramadan.

This question is in the General Section, so please answer with that in mind.