A recently announced memorandum of understanding (MOU) between the United States and Iran aimed at advancing peace in the region has generated skepticism among U.S. lawmakers and heightened tensions with Israel. The agreement, which was digitally signed by U.S. Vice President JD Vance, President Donald Trump, and Iran’s parliamentary speaker Mohammad Bagher Ghalibaf, outlines several key provisions but leaves many details to be negotiated.

One significant issue under discussion is the status of the Strait of Hormuz, a crucial maritime passage. There is concern that Iran may impose “maritime service fees” on commercial shipping after a 60-day period, which could deter international vessels from transiting the strait due to uncertainty over governance. Meanwhile, there are indications that the U.S. blockade of Iranian ports has eased, as an increasing number of ships have begun to move.

The agreement also touches on economic matters, including the establishment of a $300 billion Iran investment fund aimed at compensating Iran instead of fulfilling its demands for reparations from the U.S. and Israel over what Tehran views as an unjust war. Iran is also seeking access to about $24 billion in frozen assets held abroad, including $8 billion in Qatar, though U.S. officials have been vague on whether and when these funds will be unfrozen.

Nuclear-related provisions reportedly include options for downblending Iran’s stockpile of highly enriched uranium to 3.67% purity, a level acceptable for civilian use but insufficient for weaponization. However, the agreement preserves Iran’s right to conduct uranium enrichment domestically, a core red line for Tehran.

U.S. lawmakers, particularly Senate Republicans, have expressed frustration over the lack of transparency surrounding the agreement. Senate Majority Leader John Thune acknowledged not having received a briefing on the deal, echoing concerns voiced by colleagues such as Thom Tillis and Lindsey Graham about insufficient details and the possibility of the deal being a “secret.” Senate Minority Leader Chuck Schumer called for full public disclosure and congressional briefings to ensure accountability.

Vice President Vance described the memorandum as a preliminary document, roughly one and a half pages long, with specifics still to be worked out, and cautioned against accepting criticism based on Iranian hardline rhetoric. Meanwhile, reactions from Israel have been notably cautious. Prime Minister Benjamin Netanyahu, who has historically maintained a close relationship with successive U.S. administrations, acknowledged divergences with President Trump and refrained from fully endorsing the deal, emphasizing the need to protect Israel’s security interests wisely. He also warned that the exact terms of the agreement remain unclear.

The discord between Netanyahu and Trump has become increasingly apparent, compounded by recent Israeli military actions in Lebanon that Trump publicly criticized as ill-timed. Observers note that Trump’s eagerness to end the conflict he initiated in February is reshaping regional dynamics, potentially isolating Israel and complicating Netanyahu’s political standing ahead of elections.

Experts suggest that Netanyahu faces significant challenges maneuvering within an evolving regional framework where U.S. strategic interests—now mediated through Gulf and Pakistani intermediaries—may diverge from Israel’s priorities. The upcoming formal signing and ensuing months of negotiation and ceasefire implementation are expected to test the durability of the arrangement and highlight the tensions between involved parties.