During the introduction of Russian troops into Syria in 2015, Moscow was able to test all kinds and types of weapons it possessed, Deputy Defense Minister of RF Yury Borisov reported to journalists.

Su-35S and Su-30 SM fighters, Su-34 fighter-bombers, Su-24M front-line bombers, Su-25SM attack aircraft, Tu-160 long-range aircraft, Tu-22M3 and Tu-95MS long-range aircraft, were tested in combat conditions as well as helicopters Ka-52, Mi-24, Mi-35 and Mi-28. Among the tested military equipment were also controlled aerial bombs with various guidance systems, cruise air-launched missiles with a launch range up to 4,500 kilometers.

“It should be noted that during the special operation, not only serial armament models are used, but also promising ones that are at the stage of development and testing,” Borisov said.

Reference: Russian troops were sent to Syria by Vladimir Putin at the request of his ally and the current president of the regime Bashar al-Assad, under the pretext that Russia's military aggression in Syria is the "best training" for the military.
Civil war in the country began in March 2011 with the shooting of peaceful demonstrators by soldiers. As an ally of the repressive regime of Bashar al-Assad, the Russian Air Force, systematically conducted air strikes allegedly on the positions of the Syrian opposition, while destroying the civilian population.

Photo and source: AA