The IRGC and its affiliates have been expanding Iran's footprint in Syria and cashing in on reconstruction activity in strategic areas.
The Lebanese militia is facing increasing opposition from within the Shia community, with those who hold opposing viewpoints speaking out.
Political, social and economic woes have pushed many Iranians to leave their homeland and begin a new life.
Iranian military vessels tried to 'impede the passage' of a UK oil tanker in the Strait of Hormuz but were warned off by a British warship.
The officials are accused of leveraging their positions to facilitate efforts by Hizbullah and Iran to undermine Lebanese sovereignty.
Iran's announcement that it is breaking the terms of the 2015 nuclear deal has elicited international statements of regret and warning.
Differences regarding the 2015 nuclear deal also have revealed internal divisions and contradictory views among the Iranian leadership.
Incapable of suppressing internal protests on its own, the IRGC has sparked further popular protests by bringing in its foreign affiliates.
These militias crossed the border to assist with flood relief efforts, but have not shown the same concern for their compatriots, experts say.
Arab League and Gulf Co-operation Council emergency summits in Mecca have delivered a strong message against Iranian interference.