These are the 11 types of Russian military jets and planes known to be stationed in Syria

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:

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1. Su-57

The Israeli satellite images showed two Su-57s at Hmeimim air base.

The Su-57 is Russia's first fifth-generation stealth jet, but they are only fitted with the AL-41F1 engines, the same engine on the Su-35, and not the Izdelie-30 engine, which is still undergoing testing. 

2. Su-24

The satellite images from July showed 11 Su-24 Fencers, but that number might now be 10, since one Fencer crashed in October, killing both pilots.

The Su-24 is one of Russia's older aircraft and will eventually be replaced by the Su-34, but it can still carry air-to-air and air-to-surface missiles, as well as laser-guided bombs.

3. Su-25

The July satellite images showed three Su-25 Frogfoots.

The Frogfoot is another of Russia's older attack aircraft. It's designed to make low-flying attack runs and is comparable to the US's legendary A-10 Warthog. 

Su-25s had flown more than 1,600 sorties and dropped more than 6,000 bombs by March 2016, just six months after their arrival in Syria.  

One Su-25 was also shot down by Syrian rebels and shot the pilot before he blew himself up with a grenade in early February 2017.