Turkey and the Libyan civil war

Giorgio Cafiero provides an update on the regional power considerations involved in Turkey's threat to militarily intervene in Libya: Why Turkey is Sending Troops to Libya Responsible Statecraft 01/02/2019.

Libya, of course, was the target of a successful regime change operation in which President Barack Obama and Foreign Minister Hillary Clinton intervened militarily along with NATO members France and Britain. A civil war has been raging there since 2014.

... with Russia aligning itself more closely with the UAE, Egypt, and Saudi Arabia in supporting Haftar’s side, Turkey’s bold moves will add further complications to Turkish-Russian relations. Against the backdrop of the dire crisis in Idlib, which is testing the Astana Process’s sustainability, the extent to which Ankara and Moscow will be able to find common ground vis-à-vis Libya will heavily impact bilateral affairs between Turkey and Russia at a sensitive time. Of course the U.S. and Russia are the main countries that could likely contain Turkish actions in Libya, and if either attempts to do so in any meaningful or decisive way, Turkey will almost inevitably continue trying to capitalize on Washington and Moscow’s geopolitical competition in the Middle East and Africa to suit Ankara’s own interests and agendas. [my emphasis]

As Cafiero explains, the internationally recognized Government of National Accord (GNA) is a military offensive by the opposition Libyan National Army (LNA) headed by Gen. Khalifa Haftar, with Turkey being "the one power that is truly helping the GNA survive."