The presidents of Rwanda and Uganda pledged to seek a resolution to the tensions that have arisen between their two countries in recent months.
At a summit in Angola, Rwanda's Paul Kagame and Uganda's Yoweri Museveni, once close allies, exchanged public accusations of spying on each other's territory and political interference.
Trade has been severely disrupted since late February when Rwanda abruptly closed the border with its northern neighbor, severing a major economic land route.
Despite a brief interlude in June, the frontier has remained shut, damaging the economies of both countries reliant on cross-border trade.
Ugandan police accused Rwandan soldiers of entering the country and killing two men in May, prompting an angry denial from Rwanda.
The regional security conference in Luanda, hosted by Angola's President Joao Lourenco, brought together Kagame, Museveni, and DR Congo President Felix Tshisekedi.
The summit welcomed the political will of Rwanda and Uganda to continue dialogue with a view to finding a solution to existing problems.
