First, conflict prevention is the order of the day. The best way the UN can save lives and reduce spiralling costs is by preventing war from breaking out in the first place. This means the UN needs to adopt a culture of prevention across the organization. And the UN cannot go it alone. There needs to be more burden-sharing by member states, including both traditional donors and emerging powers.
Second, the form and function of peacekeeping should be shaped by the situation on the ground, not the (often competing) political interests at the UN headquarters in New York. The UN also has to abandon cookie-cutter approaches to peace support missions. To do this, the UN Security Council has to be more flexible about determining when troops should enter, how long to stay, and when to exit.