[1] His father's involvement in trade allowed Sava to be sent to the Republic of Venice, then Spain and France where he acquired broad education.

Peter the Great built St. Petersburg to have a Russian port in the north, so as not to depend on the blackmail of Western traders who determined the prices of warehouses, had a monopoly on trade and kept Russia captive.

It is alleged that Vladislavich, with his skill, de facto saved Peter in a conflict with King Charles XII of Sweden.

The Swedes agreed with the Turks to attack Russia on two fronts, but Vladislavich found out about it from trusted intelligence sources and told Peter once he arrived from Constantinople in 1708.

[2] The "Illyrian Count" (as Vladislavich liked to style himself) maintained trade contacts with fellow Serbs and was under the impression that they would rise in revolt against the Sultan as soon as the Tsar invaded the Danubian Principalities.

Vladislavich entertained the aristocracy of Venice as well as foreign visitors, Ernest Louis, Landgrave of Hesse-Darmstadt (1667–1739), Charles I, Landgrave of Hesse-Kassel (1654–1730), Count Girolamo of Colloredo-Waldsee, Governor of the Duchy of Milan (then under Austrian rule), Prince Teodor Konstanty Lubomirski, Anselm Franz, 2nd Prince of Thurn and Taxis, and Count Charachin.

While in Italy, among other commissions, he supervised the education of Russian nobles (such as painter Ivan Nikitich Nikitin) and prepared important, secret political treaties with Pope Clement XI.

[4] He retraced the steps of Spathari's travels, leading a large Russian mission to negotiate a new treaty with the Qing Empire.

The extended and fractious negotiations with the Qing Emperor and his officials resulted in the Treaty of Burya, which adopted the doctrine of Uti Possidetis Juris for delimiting the Russo-Chinese border.

As a reward for his part in securing a favourable treaty with China and establishing the Tea Road between the two countries, he was invested with the Order of St. Alexander Nevsky.

In 1722, Sava Vladislavich published his most famous work, a translation in Russian of Mavro Orbin's Il regno de gli Slavi (1601; The Realm of the Slavs), which included a long passage on Kosovo.

During two and a half decades, he took part in all important events of the Russian empire as a legate of the Czar (Peter the Great) and Czarina (Catherine I of Russia).