 In the Radical cabinet of Nikola Pašić in 1906 Vesnić was Minister of Justice and afterward returned to Paris, as the Minister of Serbia to France.After the Balkan wars, Vesnić was a member of the Serbian delegation at the Conference of Ambassadors in London (1912–1913).During the First World War, Milenko R. Vesnić successfully organized various conferences in favor of war effort of Serbia, considered as "the heroic ally of France".