Russia is sending more warplanes to Syria to bolster its air campaign, according to reports.
Deutsche Welle: Moscow to send more warplanes into Syria as Aleppo fighting rages
A picture shows two Russian S-400 Triumf S-400 Triumf missile system at the Russian Hmeimim military base in Latakia province, in the northwest of Syria, on December 16, 2015. (AFP)
