M23's promise to end its rebellion "signals an important milestone," said Tariq Riebl, Oxfam's humanitarian coordinator for Congo, adding that attention must now shift to eliminating other threats to civilians.
"The demise of one group doesn't spell the end of conflict in the country's east," he said.
"Now, more than ever, the Congolese government and international community must take steps to ensure that other groups don't move in to fill the space left by the disbanding of M23."
On Wednesday, the head of the United Nations peacekeeping mission in Congo pledged to do just that.
"Armed groups should know that we're not going to leave a void. We are going to respond with force against all threats to the civilian population," Martin Kobler said.
The greatest remaining menace comes from the FDLR, a group led by Rwandan Hutus who helped commit the 1994 genocide and later escaped to Congo. The presence of the FDLR has prompted Rwanda to invade Congo twice before in an attempt to wipe out the group. It also has provoked a series of Congolese Tutsi rebellions, including the latest one launched by M23 in April 2012.
While the FDLR has weakened in recent years, analysts say it is still well entrenched and its presence in eastern Congo is a reason many of the other armed groups say they exist.
Even as the Congolese military celebrated its victory, attention began shifting to the tasks now ahead to secure the peace.
Kobler briefed a closed meeting of the U.N. Security Council in New York by videolink, and China's U.N. Ambassador Liu Jieyi, the council president, said members will be responding with "a very important message" to help countries in the region achieve peace and security on a wide scale.
France's U.N. Ambassador, Gerard Araud, said his country will circulate a draft presidential statement later Wednesday.
"This success is only the beginning," Araud said. "M23 combatants must now be disarmed. The Congolese administration needs to get back to the areas that were recovered and provide basic services to the population. All other armed groups beside the M23 which threaten civilians in the Kivus need to be neutralized ... and finally the states of the region must deal with the root causes of the conflict."
Rwanda's U.N. ambassador, Eugene Richard Gasana, said the Congolese army and U.N. peacekeeping troops, including its new intervention brigade, must go after the FDLR immediately. "Otherwise I won't let them sleep," he said.
Congo's U.N. Ambassador, Ignace Gata, told reporters his country wants a durable peace. "Today we are happy to have ended the rebellion, but we know the work is not finished."
Russ Feingold, special envoy for the Great Lakes Region of Africa and Congo, said in a conference call with U.S. State Department reporters Wednesday in Washington that an agreement has been negotiated with the M23 and could be signed this week or early next week in Uganda.
That agreement has "very specific provisions" for how the group will be disarmed and protected from other fighters operating in the region. The Congolese government also must resolve the issue of who will be eligible for amnesty and reintegration.
"If this agreement goes through the way I hope it will and believe it will, it will only provide amnesty for the rank-and-file members of M23 for purposes for having been part of a rebellion," he said.
It marks a change from 2009, when a previous agreement with rebels allowed even those accused of committing major crimes to come back into the Congolese military.
Human Rights Watch has accused the M23 fighters of killing scores of civilians and forcibly recruiting child soldiers, among other abuses. Many of the rebel group's leaders are now believed to have fled into neighboring Uganda and Rwanda.
Congo's government and a U.N. group of experts have long said neighboring Rwanda has provided weapons and other support to M23, a claim the Rwandan government denies.
It remains to be seen how much sway M23's military command still has over its rebels and whether they all will abide by the order to lay down their arms, said Timo Mueller, a Goma-based researcher with the Enough Project, an advocacy group active in eastern Congo.
"M23 soldiers need to disarm and to disarm they need security guarantees," he said. "It's important that the army does not resort to revenge killings and also the wider Tutsi community has to be protected."
Without full disarmament, there is a risk that the M23 could simply return with the same members only in another shape or form. The M23 itself emerged in April 2012 in the wake of a previous Tutsi rebellion. By November 2012, they swept into Goma and briefly held the city of 1 million people, only to retreat under international pressure.
In the aftermath of the Goma siege, internal divisions mounted within M23. The group was substantially weakened after its leader, Bosco Ntaganda, turned himself in to face charges at the International Criminal Court earlier this year.
The Congolese army succeeded in defeating the M23 because it reorganized to become a stronger, more competent force and it received logistical support from U.N. forces that had stronger rules of engagement, analyst said. Another crucial factor was that Rwanda's aid to the rebels substantially diminished during this latest round of clashes, they said.
In the town of Kibati, Emmanuel Kazingufu said he hopes the end to hostilities this time would be followed up with meaningful dialogue that will bring a lasting peace.
"Building and rebuilding is too tiring," he said as he put back up the walls of his home.
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Larson reported from Dakar, Senegal. Associated Press writers Saleh Mwanamilongo in Kinshasa, Congo; Deb Riechmann in Washington; and Edith M. Lederer at the United Nations contributed to this report.
