A peace agreement brokered by the White House to stem the bloodshed in the eastern Democratic Republic of Congo was signed in Washington D.C. on Friday by officials of the two African nations.

President Donald Trump signed a major minerals agreement with Rwanda and the Democratic Republic of Congo (DRC) last week as part of a broader U.S.-mediated ceasefire that has been touted as a potential turning point in efforts to end decades of violence in the region.

The agreement marks a breakthrough in talks and intends to attract billions of dollars of Western investment to a region rich in cobalt, copper, lithium and other minerals.