The Democratic Republic of Congo and defeated M23 rebels failed to sign a hoped-for peace deal Monday, after Kinshasa demanded the agreement be revised, a Ugandan government official said. The "DRC delegation has aborted the signing of agreement with M23," Ugandan government spokesman Ofwono Opondo said, adding that the meeting was "adjourned sine die (without date)."

Soon after the end of the M23 rebellion that threw parts of eastern Democratic Republic of the Congo (DRC) into conflict for much of the last two years, a blog post titled "We Stopped M23" appeared on the website of a California-based nonprofit called Falling Whistles. The slick homepage describes the organization as “a campaign for peace in Congo." It urges visitors to “be a whistleblower for peace” by purchasing stylish metal whistles, hung on a chain or black cord, from the organization's online store.

The M23 rebel group declared an end to its 20-month rebellion in the eastern Democratic Republic of Congo on Tuesday, saying it was ready to disarm its troops and pursue a political solution. The movement has decided "to end its rebellion from this day forward and pursue, by purely political means, the search for solutions to the root causes that led to its creation," M23 leader Bertrand Bisimwa said in a statement.

The United Nations announced a milestone this week. For the first time, a UN-led force helped beat back a rebel group to protect a civilian population. Instead of its usual defense-only peacekeeping, the UN engaged in aggressive peace enforcement – with helicopters, snipers, and artillery. The Security Council authorized the unprecedented offensive last March for Congo. But the UN’s Force Intervention Brigade only began fighting in August, alongside Congo’s military, against a rebel force known as M23.