Arms need to come from someplace. In the case of the Khmer Rouge, those landmines were made by the chinese government 1. Sanctions could therefore land on china

Arms need to come from someplace. In the case of the Khmer Rouge, those landmines were made by the chinese government 1. Sanctions could therefore land on china for not accounting for mines they created. For the case of governments that truly have no responisble parties remaining afterwards, say the land is littered with IEDs, then the UN should have funds set aside to go towards these efforts, just like how they have funds going to other humanitarian efforts. But when its possible its best to charge the offending governments if they are still around than to have the world subsidize them. 1. https://en.wikipedia.org/wiki/Land_mines_in_Cambodia https://en.wikipedia.org/wiki/Land_mines_in_Cambodia