U.S.-Iran Interim Deal Faces Strain Over Lebanon Violence and Nuclear Enrichment Rights

Implementation of the June 17 interim peace memorandum between the U.S. and Iran has seen significant progress alongside critical setbacks. The U.S. naval blockade of the Strait of Hormuz was officially lifted on June 18, allowing the first commercial tankers—including Saudi vessels—to transit the waterway fee-free for a 60-day period. This comes as Vice President JD Vance and Iranian officials established a framework for IAEA nuclear monitoring and a military deconfliction cell. However, regional stability remains fragile as renewed fighting between Israel and Hezbollah in Lebanon has broken a weekend ceasefire, leading President Trump to threaten further military action if Iranian-backed forces do not stand down. Despite the reopening of shipping lanes and the waiving of certain oil sanctions, diplomatic hurdles remain. Iranian President Masoud Pezeshkian stated during a high-stakes visit to Pakistan that Iran will "never back down" from its right to enrich uranium or its missile programs, issues that the current MOU leaves to future negotiations. Domestically, the U.S. Senate narrowly passed a War Powers Resolution to limit President Trump's executive authority regarding future military engagement with Iran, reflecting bipartisan concerns over the financial and political costs of the ongoing conflict. Analysts remain skeptical of the deal's longevity, noting that it focuses on immediate de-escalation rather than dismantling Iran's long-term nuclear or proxy capabilities.