DAKAR, Senegal (AP) — Congo and Rwanda will sign a peace agreement in Washington on June 27 that aims to ending fighting in eastern Congo, the two countries and the U.S. State Department said.

Congo has accused Rwanda of backing M23 rebels in its mineral-rich eastern region across the border with Rwanda. U.N. experts say the rebels are supported by about 4,000 troops from Rwanda, which has denied backing M23.

The decades-long conflict escalated in January, when the M23 rebels advanced and seized the strategic Congolese city of Goma, followed by the town of Bukavu in February.

The draft agreement includes "provisions on respect for territorial integrity and a prohibition of hostilities; disengagement, disarmament, and conditional integration of non-state armed groups," the joint statement said Wednesday. The agreement also includes a commitment to respecting territorial integrity and the conditional integration of non-state armed groups.

Congo and Rwanda are not formally at war and in the past had held peace talks that have largely stalled, including those hosted by Qatar.

Corneille Nangaa, leader of the Congo River Alliance, a coalition of rebel groups, told The Associated Press in April that international sanctions and Congo’s proposed minerals deal with the United States in search of peace would not stop the fighting.

Christian Moleka, a political scientist at the Congolese think tank Dypol, told The Associated Press that he believes that the duration of the agreement will depend on “Kinshasa’s willingness to undertake structural reforms of the security apparatus, and the commitment of the international community to accompany the reforms to the end.” He added that the proposed agreement did not significantly differ from previous attempts at peace.

M23 is one of about 100 armed factions vying for control in eastern Congo. But unlike the others, they are mainly made up of ethnic Tutsis who failed to integrate into the Congolese army. The group says it is defending ethnic Tutsis and Congolese of Rwandan origin from discrimination, although critics say their Rwanda-backed campaign is a pretext for economic and political influence over eastern Congo.

Rwanda’s longtime President Paul Kagame accuses Congolese President Felix Tshisekedi of overlooking the concerns of the ethnic Tutsis and ignoring previous peace agreements.