How does this relate to Russia’s cooperation with Haftar trying to cause a migrant crisis in Europe?
It relates as France is willing to work alongside Russian interests in North Africa, if France believes it to serve their own interests. Now it backfires and that was predictable. It also raises questions about France reliability in fending off Russian threats to the EU.
More in general it raises question about the EUs conduct towards Haftar, Libya and North Africa in general, believing that war-lord slave-traders would be suitable "partners" for fending of refugees reaching EU countries.
https://www.politico.eu/article/frances-double-game-in-libya-nato-un-khalifa-haftar/
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https://www.aljazeera.com/news/2019/7/12/libya-asks-france-to-explain-how-its-arms-reached-haftar-forces
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https://www.ft.com/content/3b85dd0e-1f2e-40b0-b44b-947b7f75a03e
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Note that the UAE is also keeping the Civil war in Sudan going and aiding in massacres that could amount to genocidial acts in order to extract resources from Sudan. The UAE, Egypt and Saudi Arabia are key allies to Israel in West Asia and North Africa, which further intertwines them and Russia with France in destabilizing the region and supporting grave violations of human rights and international law.