Israeli satellites on Saturday revealed two Russian Su-57s at its Hmeimim air base in Syria.

A Russian official said the Su-57s were deployed to the war-torn country as a deterrent "for aircraft from neighboring states, which periodically fly into Syrian airspace uninvited."

Additional satellite images from July 2017 also showed 10 other kinds of Russian jets and planes, 33 aircraft altogether, stationed at its air base in Latakia.

There's probably, however, more than 33, as some jets and aircraft could have been conducting sorties or flying elsewhere when the images were taken.

Moscow first sent fighter jets to Syria in 2015 to help the Assad government, which is a large purchaser of Russian arms. In the last few months, Russia and the Syrian regime have increased bombing runs in Idlib and Eastern Ghouta, killing, injuring and displacing thousands of civilians.

Here are the 11 kinds of military jets and planes Russia has in Syria now: