[1] Denis Sassou Nguesso returned to power at the conclusion of the June–October 1997 civil war, and he appointed Djombo to the government as Minister of the Forest Economy on 2 November 1997.
The Wildlife Conservation Society called the decision "an extraordinary achievement for the entire Congo basin region" and praised the Congolese government's environmental policy.
In this letter, he accused his rivals from Likouala, particularly Ambassador to Italy Mamadou Kamara Dékamo, of slandering him over the course of two and a half years and plotting to kill him on 10 September 2007.
He said that this alleged plot "painfully reminded" him of an unsuccessful attack that he and his family escaped at their home on 7 June 1997, at the beginning of the 1997 civil war.
[13] At the time of the July 2009 presidential election, Djombo was Head of the Electoral Affairs Department for Sassou Nguesso's re-election campaign.
[14] After the election, in which Sassou Nguesso won an overwhelming majority, Djombo's ministerial responsibilities were expanded on 15 September 2009, when he was appointed as Minister of Sustainable Development, the Forest Economy, and the Environment.
[16] After Sassou Nguesso's victory in the March 2016 presidential election, Djombo was appointed as Minister of State for Agriculture, Animal Husbandry and Fishing on 30 April 2016.