A newly signed U.S.-Iran agreement, described by its backers as historic because it is the first pact between American and Iranian presidents since Iran’s 1979 revolution, is changing how regional governments and groups assess the balance of power. Supporters argue the deal increases regional stability by advancing diplomacy and creating a more secure framework for Iran’s relationship with the United States.

At the same time, multiple adversaries across the Middle East view the agreement with concern. Israel, several Gulf states, and political and militant factions in Lebanon express alarm that the accord could strengthen Iran’s position. Their concerns center on Iran becoming more internationally legitimate and potentially more capable of expanding its influence in regional politics.

The sources present the agreement as a shift in both security calculations and diplomatic positioning: while Iran’s backers highlight benefits and leverage through negotiations, critics across the region argue it could reduce pressure on Tehran and alter deterrence dynamics. Overall, the deal is portrayed as a factor that redraws regional alliances and expectations going forward.