With many others after the Khmer Rouge had entered Phnom Penh, Ramousse was locked up at the French Embassy for 12 days before being expelled from Cambodia along with all foreign nationals.

[6] On 21 February 1992, Ramousse was granted an audience by King Sihanouk in which he was encouraged to develop the work of the Catholic Church in Cambodia.

[7] He was again appointed vicar apostolic of Phnom-Penh on 6 July 1992 by Pope John Paul II following the appeasement of the conflict and the return of some missionary priests to Cambodia in 1990.

[8] His missionary efforts in favour of the Church and the people of Cambodia were acknowledged by Pope John Paul II during his ad limina visit in Rome on 11 February 1999.

[9] He resigned for reasons of age on 14 April 2001, giving way to another French bishop of the Foreign Missions of Paris, Emile Destombes,[1] his coadjutor since 1997.