AUTHOR: Arthur Viorel TULUŞ Danubius, XXXV, Galaţi, 2017, pp. 117-132. Abstract The Black Sea came back into the attention of European diplomacy in the first half of the XIXth century, on the background of tsarist Russia’s expansion politics towards the Straits, with domination of the Mouths of the Danube being a mandatory step in that…