The EU's designation of IRGC as terrorist organization affected relations mainly with:

1. South America
2. Middle East
3. East Asia
4. Africa

The EU’s January 2026 terrorist designation of Iran’s Revolutionary Guard primarily impacted European relations with the Middle East, particularly Iran and its regional partners. Tehran condemned the decision as provocative and legally baseless, threatening reciprocal measures. The designation complicated European diplomatic engagement with Iran on nuclear negotiations, regional conflicts, and consular affairs, while straining EU-Gulf relationships amid divided regional responses.