Rwanda seems to stick out as a case of 'world should have done something' or a case of 'world could not have done anything.' I want to know what actions were considered, and what were possible options the int'l community had to intervene or not.
The various options available and considered included:
Authorization of more UN or other troops - This option was considered, but in large part ruled out. Countries were reluctant to commit troops to stop the genocide because they had already seen the murder of 10 Belgian troops who were mutilated while guarding an official (which was done specifically to discourage more troops being sent), particularly after the disasters in Somalia. They also struggled to find an agreed-upon method for deployment. The US called for an "outside-in" deployment, which would entail coming in from the borders of Rwanda to establish safe zones on those borders. However, many Tutsis never made it to the border in the first place. The plan offered by the UN's man on the ground was to go "inside-out", which was meant to secure Kigali and then fan outwards using airlifts to supply from there. However, it wasn't clear how the US or UN forces would arrive in Kigali, since they didn't have control of the airport. By the time the genocide had killed most of the eventual victims, the US and UN agreed on a plan that was similar to the inside-out strategy, but hardly anyone committed any troops. And when they did commit, the supplies came extremely late. It took about a month to start transporting US APCs that were requested by the UN, and even then they were missing crucial gear like radios, so by the time they arrived the genocide was all but over.
The Defense Department's arms embargo - This was proposed, and supported by the DoD, but didn't really have much bite to it. As the DoD noted, many of the killings were being conducted with knives, machetes, etc. There was no way this would have stopped the genocide, and it was merely a "soft" intervention tactic.
Destroy broadcasts or counter-broadcast - This was a potential plan floated by the US to stop Radio Mille Collines from broadcasting coordinating information that assisted/encouraged those committing genocide. There were three plans considered: Destroy the antenna, transmit counter-broadcasts, or jam the broadcasts. The Pentagon ruled all three out. They said they couldn't strike the tower, and to counter-broadcast or jam the broadcasts couldn't be done from the ground due to the terrain, and even air jamming would have been difficult. The Air Force's Commando Solo plane was proposed, but it was ruled out as well; it was costly ($8,500 an hour to use), would have required moving the plane over to there, required getting the go-ahead from multiple countries in the area around, and then it would've had to be approved. By that time, the plane would've been useless anyways.
I know there were other options discussed, but these are the ones that stick out best in my mind right now. I suggest reading "Bystanders to Genocide" by Samantha Power, and One-hundred Days of Silence: America and the Rwanda Genocide by Jared Cohen.