'Fostering peace and regional stability' means nations are able to coexist peacefully without significant conflicts or threats. Abiy'a being told to end his Red Sea war rhetoric with Eritrea.
"Today in Addis Ababa, I was honored to meet with Ethiopian Prime Minister Abiy Ahmed to reaffirm the enduring partnership between our nations. We emphasized the importance of Ethiopia's engagement with its neighbors [Eritrea] and its role in fostering peace and regional stability, a key priority of President Trump. We also discussed a range of commercial opportunities that advance mutual prosperity for the United States and Ethiopia."
Massad Boulos, President Trumps Senior Adivsor
https://x.com/US_SrAdvisorAF/status/1968364249454936452