• A France- and UK-led coalition of over 40 countries is preparing a defensive mission to reopen the Strait of Hormuz, but it is not a NATO operation.
  • The mission will only activate after a ceasefire or provisional peace, with no confirmed July deadline from NATO itself.
  • European allies remain cautious, with Germany requiring parliamentary approval and Spain and Poland ruling out naval contributions.

Coalition Plans Underway

Plans to reopen the Strait of Hormuz are taking shape, but not under NATO's banner. According to people familiar with the matter, a coalition of more than 40 nations—including key NATO members plus South Korea, Australia, and Japan—met in Paris in April 2026 to finalize a strictly defensive mission. UK Prime Minister Starmer confirmed the operation "won't be... a NATO mission," emphasizing its separate, contingency-based nature.

The mission will only activate once a ceasefire or provisional peace is reached between Iran, the US, and Israel. Without a deal, the strait—through which a significant portion of global oil supply transits—would remain closed, threatening energy markets and supply chains.

July Deadline Speculative

Despite some reports suggesting a July deadline, no official NATO announcement exists. The timeline is instead tied to diplomatic progress. "We're ready to preposition assets, but we need a clear signal that the conflict is winding down," a coalition official said, speaking on condition of anonymity.

US President Trump has pressured allies to join, warning of "very bad" consequences for holdouts. However, European governments remain wary. German Chancellor Merz stated that any German participation requires at least a provisional ceasefire and parliamentary approval. Spain and Poland have already ruled out naval contributions.

A Cautious Approach

The coalition's mandate is strictly defensive, focusing on minesweeping and escorting commercial vessels. France and the UK are leading the effort, coordinating with regional partners. NATO Secretary-General Mark Rutte said in March 2026 that allies are discussing the "best way" to reopen the strait collectively, but the alliance itself has not authorized the mission.

The exclusion of the US from decision-making has complicated the picture. As one European diplomat put it, "This is not NATO's war. We need a clear mandate that doesn't drag us into a hot conflict."

Correction: An earlier version of this article incorrectly stated that a July deadline had been formally set by NATO. No such deadline exists.