Relationship dossier
Belgium
Iran
Relationship assessment
Diplomatic engagement persists amid serious disputes over security cases and detained nationals.
Belgium toward Iran
-20Belgium has supported diplomatic efforts, including the 2015 nuclear agreement with Iran. Belgian courts convicted Iranian diplomat Assadollah Assadi in a terrorism case, and Belgium returned him to Iran in the 2023 exchange for Olivier Vandecasteele.
Iran toward Belgium
-35Iran detained Belgian citizen Olivier Vandecasteele and released him in May 2023 in exchange for Iranian diplomat Assadollah Assadi, who had been convicted in Belgium. The detention and exchange have been a major source of strain in relations.
Overall relationship
-25The relationship combines continuing diplomatic engagement and support for nuclear diplomacy with serious security and consular disputes. The 2023 prisoner exchange demonstrated a capacity for negotiation, while the detention of a Belgian citizen and the return of a convicted Iranian diplomat reflected substantial bilateral tension.
How to read these scores
Scores are rough judgments, not objective measurements or current verification. Directional scores describe government policy and conduct, not public opinion. The overall score is an independent estimate, never an average.
- −100
- Extreme sustained hostility
- −50
- Substantially adversarial
- 0
- Mixed or neutral, supported by knowledge
- +50
- Substantially cooperative
- +100
- Exceptionally close sustained partnership
“Not assessed” means there is no recorded score. Pair existence makes no claim about diplomatic recognition or established relations.
Relationship context
Overview
Belgium and Iran have maintained diplomatic contact, but relations have been strained by Iran-related security cases and the detention of Belgian citizen Olivier Vandecasteele. Belgium has supported diplomatic efforts over Iran's nuclear programme, while the 2023 exchange of Vandecasteele for Iranian diplomat Assadollah Assadi underscored both governments' capacity to negotiate and the severity of their disputes.
Areas of tension
- Iran's detention of Belgian citizen Olivier Vandecasteele and his 2023 exchange for Assadollah Assadi.
- The conviction in Belgium of Iranian diplomat Assadollah Assadi in a terrorism case.
- Disagreements over Iran's nuclear programme and related international sanctions.
Key developments
Belgian courts convicted Iranian diplomat Assadollah Assadi in a terrorism case.
Belgium and Iran exchanged Olivier Vandecasteele for Assadollah Assadi, who returned to Iran.
Major uncertainties
- The extent of ongoing Belgian-Iranian diplomatic and economic cooperation is unclear.
- The implementation and future use of the bilateral prisoner-transfer treaty remain uncertain.