| 1967 - 1973 |
 |
Royal Embassy of Cambodia and Mission of GRUNC in Paris |
| 1973 - 1975 |
|
Ambassador to Cuba |
| 1975 - 1979 |
|
Prisoner of the Khmer Rouge |
| 1980 - 1982 |
|
Vice Minister of Foreign Affairs |
| 1982 - 1989 |
|
Ambassador to the former USSR |
| 1987 - 1991 |
|
One of the key negotiators in the peace talks to end the "Cambodia Conflict" |
| 1989 - 1990 |
|
Minister of the Council of Ministers in charge of Foreign Affairs |
| 1990 - 1993 |
|
Minister of Foreign Affairs |
| 1991 - 1993 |
|
Member of the Supreme National Council of Cambodia and Minister of Foreign Affairs |
|
|
Signatory to the Paris Peace Accord |
| 1993 |
|
Senior Minister of the Provisional National Government |
| 1993 - 1998 |
|
Ambassador of the Kingdom of Cambodia to France |
| 1998 - 2003 |
|
Senior Minister,
Minister of Foreign Affairs and International Cooperation
Member of the National Assembly |
| 2003 - Present |
|
Deputy Prime Minister,
Minister of Foreign Affairs and International Cooperation
Member of the National Assembly |