Arbitration Commission of the Peace Conference on Yugoslavia
On 20 November 1991 Lord Carrington asked: "Can the internal boundaries between Croatia and Serbia and between Bosnia and Herzegovina and Serbia be regarded as frontiers in terms of public international law?" Applying the principle of "uti possidetis juris", the commission concluded on 11 January 1992, "The boundaries between Croatia and Serbia, between Bosnia and Herzegovina and Serbia, and possibly other adjacent independent states may not be altered except by agreement freely arrived at... Except where otherwise agreed, the former boundaries become frontiers protected by international law".
Sava Grujić
By early 1878, the Royal Serbian Army had captured most of the South Morava basin, liberating Vranje and Leskovac, reaching as far as Preševo, Vitina, and the monastery of Gračanica near Priština in Kosovo, revered by romantic nationalists as the seat of the medieval Serbian Empire.
The Sultan sued for peace; and on March 3rd 1878 a peace treaty is signed by Russia and Turkey at San Stefano, a village west of Istanbul.
The formal independence of Serbia from the Ottoman Empire is internationally recognised at the Congress of Berlin on July 13th 1878, however the new treaty significantly changes the terms of the Treaty of San Stefano, Serbia's territory gain is reduced and Austria-Hungary is given a mandate to occupy and administrate Bosnia and Herzegovina. 
This marks the start of Sava Grujic's diplomatic career.