Hi Joey, Yes,you're right, there's some difference between the two words. The word 'relationship' is based on intimacy/affair while the word 'relation' includes only familial/blood ties or business ties. Examples: Brad Pitt and Angelina Jolie are having a relationship.
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Joey_fiveso that means I can say something like "the relation between China and the USA is great"Better English would be:
and "John and Mary have just broken up. Their relationship is done."