According to the Daily Mail, two Russian ships (Project 117 LST Orsk 148 and RoRo Alexandr Tkachenko) have been spotted crossing the Bosporus as they were making their way to the Syrian port of Tartus. The photos taken show that they were transporting military materials such as Soviet BTR-80 armoured vehicles used for transporting troops.

Russian reinforcements head for Syria”, Jessica Finn & Jennifer Smith, The Daily Mail, April 16, 2018.