President Donald Trump praised the leaders of the Democratic Republic of Congo and Rwanda for their courage as they signed onto a deal on Thursday aimed at ending the conflict in eastern Congo and opening the region’s critical mineral reserves to the U.S. government and American companies.

The moment offered Trump — who has repeatedly and with a measure of exaggeration boasted of brokering peace in some of the world’s most entrenched conflicts — another chance to tout himself as a dealmaker extraordinaire on the global stage and make the case that he’s deserving of the Nobel Peace Prize. The U.S. leader hasn’t been shy about his desire to receive the honor.

“It’s a great day for Africa, a great day for the world,” Trump said shortly before the leaders signed the pact. He added, “Today, we’re succeeding where so many others have failed.”

Trump welcomed Presidents Felix Tshisekedi of Congo and Paul Kagame of Rwanda, as well as several officials from other African nations who traveled to Washington to witness the signing, in the same week he contemptuously derided the war-torn country of Somalia and said he did he did not want immigrants from the East African nation in the U.S.

Lauded by the White House as a “historic” agreement brokered by Trump, the pact between Tshisekedi and Kagame follows monthslong peace efforts by the U.S. and partners, including the African Union and Qatar, and finalizes an earlier deal signed in June.

The Central African nation of Congo has been battered by decadeslong fighting with more than 100 armed groups, the most potent being the Rwanda-backed M23 rebels. The conflict escalated this year, with M23 seizing the region’s main cities of Goma and Bukavu in an unprecedented advance, worsening a humanitarian crisis that was already one of the world’s largest, with millions of people displaced.

The conflict can be traced to the aftermath of the 1994 genocide in Rwanda, where Hutu militias killed between 500,000 and 1 million ethnic Tutsi, as well as moderate Hutus and Twa, Indigenous people. When Tutsi-led forces fought back, nearly 2 million Hutus crossed into Congo, fearing reprisals.

Rwandan authorities have accused the Hutus who fled of participating in the genocide and alleged that elements of the Congolese army protected them. They have argued that the militias formed by a small fraction of the Hutus are a threat to Rwanda’s Tutsi population.

Congo’s government has said there can’t be permanent peace if Rwanda doesn’t withdraw its support troops and other support for the M23 in the region. Rwanda, on the other hand, has conditioned a permanent ceasefire on Congo dissolving a local militia that it said is made up of the Hutus and is fighting with the Congolese military.

U.N. experts have said that between 3,000 and 4,000 Rwandan government forces are deployed in eastern Congo, operating alongside the M23. Rwanda denies such support, but says any action taken in the conflict is to protect its territory.