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

A Russian official said the Su-57s were deployed to the war-torn country as a

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:

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

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

This photo, taken near the Hmeimim air base in 2015, shows an Su-25 carrying OFAB-250s, which are high-explosive fragmentation bombs.

Source: Sim Tack, chief military analyst at Force Analysis.

This shows a Russian airmen fixing a RBK-500 cluster bomb to an Su-25 in Syria in 2015.

Source: Sim Tack, chief military analyst at Force Analysis.

4. Su-27SM3

5. MiG-29SMT

Mig-29SMT Fulcrums to Syria for the first time in September, so they were not seen in the satellite images from July.

The upgraded Fulcrum is able to carry a variety of air-to-air and air-to-surface missiles as well as laser-guided bombs.

The video below shows the Mig-29SMTs in Syria for the first time.

Kampf um Syrien: Baschar al-Assad mit russischer Hilfe auf der Sieger-Straße

6. Su-30SM

The satellite images from July showed four Su-30SMs.

The Su-30SM, a versatile multirole fighter that's based off the Su-27, carries a variety of air-to-air and air-to-surface missiles and laser-guided bombs.

7. Su-34

The July satellite images showed six Su-34 Fullbacks.

The Fullback, which first deployed to Syria in September 2015, was Russia's most advanced fighter in the war-torn country for over a year.

The picture shows a Russian airman checking a KAB-1500 cluster bomb on an Su-34 in Syria in 2015.

Source: Sim Tack, chief military analyst at Force Analysis.

This shows Russian airmen installing precision-guided KAB-500s at the Hmeimim air base. One airman is removing the red cap that protects the sensor during storage and installation. The white ordnance is an air-to-air missile.

The video below shows a Fullback dropping one of its KAB-500s in Syria in 2015:

Нанесение авиаударов в провинциях РАККА и АЛЕППО

Source: Sim Tack, chief military analyst at Force Analysis.

8. Su-35S

9. A-50U

10. IL-20 "Coot"

11. An-24 "Coke"

The An-24 Coke is an older military cargo plane.

Below is one of the July satellite images, showing many of Russia's fighters lined up.

Since 2015, Russian airstrikes in Syria have taken out many ISIS fighters — although their numbers are often exaggerated — but they have also killed thousands of civilians.

The Syrian Observatory for Human Rights reported that between September 2015 and March 2016 alone, Russian airstrikes had killed about 5,800 civilians.

A number of monitoring groups have also accused Russia of deliberately targeting hospitals and civilians,