When two countries fight with each other, I wonder what they stand to gain from all this war and pestilence that they cause people all around the most powerful of the two country ends of buying more ammunition every day, and these are almost plagued so many countries. Into debt and someone ending war.
That war crimes law and courts are going to have a feast on them for months and years to come. The reasons from leaders even up for war, is to make it clear that they have the upper hand. Some do it because they want to resist.
The higher power and to show the world that they can do is, but other people are so merciless that they overrun everybody in their perimeter and make sure that the lesser country is shown who is the real boss.