syrian war
A short explainer video by the bbc, from 6 years ago:
<https://youtu.be/CoL0L_DbuQQ>
Tldr; rebels started fighting against an authoritarian and violent leader who had cracked down on peaceful protests. Russia is friends with the leader. U.S. is friends with some rebels. Turkey is friends with different rebels and doesn't like the friends of the U.S.
Maybe humans never should have invented guns or bombs 🙄