After the signing of Treaty of Paris in march 1856, after Crimean War the question of new frontier in Bessarabie is not decided. The congress of Paris decided to form a mixt commission to study in Bessarabia, the line of new border route. The Commission was formed by the representants of Austria, France, Great Britain, Rusia and Ottoman Empire. The Commission has encountered great difficulties, because he found in Bessarabia the existence of two towns named Bolgrad, both located close to the route indicated in article 20 of the Treaty of Paris. The Russian plenipotentiary in this commission Fonton of Verrayon said, that Bolgrad is the administrativ center of bulgarian colony in Besarabia, and is difficult to cede this territory. The documents in the annex founded in the archives of foreign policy in Paris, are the papers of french commissionner Pierre Marc Besson. This documents clearly show that the French government sustained the Rusia, to retain Bolgrad. The british commissioner Erdward Stanton want strictly execution of the Treaty of Paris. The documents also shows the position of other powers signatory to the Treaty of Paris, in the question of Bolgrad. This european problem will be resolved in 1857, after a new conference in Paris in 1857.