The killing of the Chadian president and its consequences for the French interests

 What are the consequences of the killing of Chadian President Deby on French interests?

And what is the impact of the military incident on the cohesion of the army, which Paris made an effort to form 5 +1?  And is it possible to threaten the Algerian army chief of staff, Changeriha, with this latest incident to send the Algerian army to fight in the Sahel countries?