Russian President Vladimir Putin (2ndR), accompanied by Foreign Minister Sergei Lavrov (3rdR), listens to Syrian Foreign Minister Walid Muallem (2ndL) during a meeting at the Kremlin in Moscow on June 29, 2015. AFP PHOTO / RIA NOVOSTI / ALEXEI NIKOLSKY
Photo by AFP
Amid reports of a Russian military build-up in Syria, Washington has warned the Kremlin against escalating the conflict.