June 19 (UPI) -- Rwanda will sign a U.S.-Qatar-mediated peace agreement with neighboring Democratic Republic of the Congo, bringing an end to a decades-long armed conflict within days.

The two sides' technical delegations initialed the pact Tuesday in Washington, pledging to "disengage and disarm," deal with non-state armed groups, establish a joint security cooperation mechanism and allow refugees and displaced people to return, the State Department said in a statement.

Secretary of State Marco Rubio, who has been heavily involved in bringing the deal to fruition, will witness the official signing by ministers from Rwanda and the DRC at a ceremony in Washington on June 27.

"The agreement was developed over three days of constructive dialogue regarding political, security, and economic interests. The agreement includes provisions on respect for territorial integrity and a prohibition of hostilities," the State Department said.

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