it does strike from the air.

Since the 2011 civil war and the ongoing conflict, multiple factions fighting in Libya are in possession of military aircraft. As of 2019 the Libyan Air Force is nominally under the control of the internationally recognised Government of National Accord in Tripoli, though the rival Libyan National Army of Marshal Khalifa Haftar also has a significant air force.

Not sure it really matters who specificaly was flying the jets. General Hifter has his own airforce, and Russia has their own operating in Libya with him, and they're fighting together. In this conflict Russia = Hifter and Hifter = Russia.

The Russians have intervened on behalf of the militia leader Khalifa Hifter, who is based in eastern Libya and is also backed by the United Arab Emirates, Egypt, Saudi Arabia and, at times, France. His backers have embraced him as their best hope to check the influence of political Islam, crack down on militants and restore an authoritarian order.

Mr. Hifter has been at war for more than five years with a coalition of militias from western Libya who back the authorities in Tripoli. The Tripoli government was set up by the United Nations in 2015 and is officially supported by the United States and other Western powers. But in practical terms, Turkey is its only patron.

TRIPOLI, Libya — The casualties at the Aziziya field hospital south of Tripoli used to arrive with gaping wounds and shattered limbs, victims of the haphazard artillery fire that has defined battles among Libyan militias. But now medics say they are seeing something new: narrow holes in a head or a torso left by bullets that kill instantly and never exit the body.

It is the work, Libyan fighters say, of Russian mercenaries, including skilled snipers. The lack of an exit wound is a signature of the ammunition used by the same Russian mercenaries elsewhere.