Iran has formally warned the United Kingdom and France that any foreign military activity in the Strait of Hormuz will be met with serious consequences, after the two European powers declared their readiness to deploy a wider multinational mission to protect freedom of navigation in the strategic waterway. In a message posted on social media on 4 July, Deputy Foreign Minister Kazem Gharibabadi stated that the strait “is not a military display arena for extra-regional powers” and that Iran, as the “responsible power and guarantor of security in the strait,” would hold “crisis-makers” accountable for the outcomes of any “adventurism.” The statement was a direct response to a joint communiqué issued a day earlier by British Prime Minister Keir Starmer and French President Emmanuel Macron.

The joint British-French statement described the Strait of Hormuz as a “vital artery of the global economy” and argued that restoring safe passage for vessels of all nations is a matter of international concern. London and Paris said they “stand ready to deploy the wider Multinational Military Mission to support freedom of navigation” and announced that the Sultanate of Oman had agreed to cooperate with them to secure its territorial waters against shipping risks. Iranian officials, however, rejected any external role, insisting that the security of Hormuz rests solely with the littoral states. Earlier in the week, Tehran had already dismissed remarks by President Macron about a French-Omani partnership to clear mines from the strait, asserting that such operations would be conducted by Iran alone.

The exchange unfolds against the backdrop of a fragile diplomatic framework between Iran and the United States. A memorandum of understanding mediated by Pakistan and signed electronically by the Iranian and American presidents came into effect on 18 June. The agreement provides for a cessation of hostilities, sanctions relief, resolution of nuclear issues, the reopening of the Strait of Hormuz, and broader regional security arrangements through negotiation. Viewed from Western capitals, the British-French initiative is a complementary effort to stabilise a chokepoint through which roughly one-fifth of global oil consumption passes, especially after recent disruptions during the conflict between Iran, the United States and Israel placed severe strain on energy markets.

Iranian officials maintain that the presence of extra-regional forces is itself a source of instability. Gharibabadi’s warning, echoed across Iranian state-aligned media, frames the European proposal as an infringement on coastal states’ sovereignty. Gulf analysts note that Oman’s reported cooperation with London and Paris introduces a nuanced dimension, as Muscat has historically balanced its role as a diplomatic bridge with its security ties to Western powers. The dossier remains open: while the US-Iran understanding has not collapsed, the competing visions for policing the strait signal that the path from de-escalation to a durable maritime security architecture is far from settled.