The latest arms shipment comes as Russia is facing criticism over plans to send the Syria regime S-300 surface-to-air missiles.
Secretary of State John KerryJohn KerryCongress, Trump need a united front to face down Iran One year ago today we declared ISIS atrocities as genocide Trump’s realism toward Iran is stabilizing force for Middle East MORE has also expressed opposition to Russia providing arms to Assad’s regime.
"I think we have made it crystal clear that we would prefer that Russia is not supplying assistance," Kerry said last week.
Russian Foreign Minister Sergei Lavrov said Friday that Russia’s arms sales were not violating any international agreements, according to Agence France-Presse.
"We are first and foremost supplying defense weapons related to air defense," Lavrov said in televised comments. "This does not in any way alter the balance of forces in this region or give any advantage in the fight against the opposition.”
Russia has been among Assad's biggest backers, and has blocked action in Syria from the United Nations Security Council. Russia and the United States have agreed to try to convene peace talks between the Syrian regime and opposition next month.