The United Nations in all their stupidity glory decided cluster munitions needed to be banned. But here are the best parts:
The treaty is binding only on countries that have signed and ratified it.
Wait for it:
Some of the biggest stockpilers – including the US, Russia, China and Israel – are not among the signatories.
So this treaty will only be enforced by nations that have signed it. The big three military powers, being intelligent people, decided to not sign it and can continue using cluster munitions. Why would they not sign it? Probably because they don’t want to get rid of devices that actually work.