Iran criticized a Saudi–led Gulf alliance's decision to designate the Lebanese Hezbollah movement a terrorist group, calling the move "not helpful" towards security in the region.
The comments come a day after the mostly Sunni alliance known as Gulf Cooperation Council (GCC), which comprises Saudi Arabia, Bahrain, Kuwait, Oman, Qatar and the United Arab Emirates, declared the Shiite Hezbollah a terrorist organization for "hostile acts" within the the six-nation bloc.
"That was a new mistake and not helpful for the security of stability of the region," Deputy Foreign Minister Hossein Amir-Abdollahian told Iran's IRNA news agency.
"Iran is also proud of Hezbollah as the leading front in the fight against the Zionists," he said, a reference to Israel.
Both Iran and Hezbollah support Syrian President Bashar al-Assad in the Syrian civil war and both are fighting against the extremist militia organization Islamic State.
Saudi Arabia and other Gulf monarchies support Sunni militias that are looking to topple Assad.