2 wrongs don't make a right. This will only end up with more duds scattered across the land.
They're free to use them but they'll have to clean up quickly and efficiently, and even then I think there will still be the odd dud. I'm sure civilians will be thankful that there's an eye for an eye.
Actually it's technically a part of Russia now. Hope they still help clean up in the case they lose the war. Though it is also the choice of the USA/NATO who provided those munitions in the first place. They'll definitely also help clean up, right guys?
I've searched through a few of the countries that didn't sign the convention and they either manufacture or have bought large stocks of cluster bombs (India, Argentina, US, and Brazil). The trend seems self evident.
I still don't get why we are trying to justify unloading our backlog of dangerous cluster bombs onto Ukraine soil. Blood is on the hands of the lobbyists that wanted to clear out the warehouses full of cluster bombs. We can make more munitions that we have been sending, which will be less of a hazard to Ukrainian farmers.