No UN Army
This editorial is by a Canadian, a country with some experience in Peacekeeping operations, especially those involving the UN:
The popular myth and chronic excuse offered when the UN fails to respond to an obvious security crisis is a lack of resources. In reality, this is merely a convenient way to let the Security Council's Perm 5 off the hook and mask the dominant role played by their own national self-interests...
To suggest that the existence of a UN army would have helped stop the genocide in Rwanda or could be used to take on the current genocide in Darfur is naive. The stumbling block for both was and is not a lack of resources but rather a lack of commitment beyond national self-interests by some of the Perm 5 members. In the case of Rwanda, there were no self-interests strong enough to authorize intervention; in Darfur, the self-interests of at least two members (related to oil production) mean their vetoes stand in the way of any forceful action. If a UN army did exist, it would still be sitting on its hands far away from Darfur.
We discussed the subject here.