Ukrainians are killed, Palestinians die
I‘m not sure if you interpret more into the words than there is. If you read the articles text thoroughly you’ll find a difference in those deads.
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The dies-articles: „after phone calls“ , „after x days in car“, „days after cry for help“ and others. Those are all after some time.
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The killed-articles: „in a air strike/ rocket attack“ which is immediately.
This sounds quite correct from a grammar point of view. Still, it’s sad for the kids and family.