That’s usually how international law works. It only becomes mandatory when there’s a critical mass of countries that agree. Yay, “society of states in anarchy”. /s

It’s only a war crime under international law if used against civilians. But it would of been an international crime by all use, production, transfer and stockpiling of cluster munitions if they were part of the convention.

https://m.youtube.com/watch?v=7m148vZDwJA

Brilliant.