In December, when the United States announced its military operation against Houthi rebels in the Red Sea, it had the backing of nine other nations, including five European states.
In January, when US air strikes hit Houthi bases across Yemen, targeting sites being used to disrupt international navigation, only the UK and the Netherlands showed support.
As coalitions go, it was quite the rapid diminishment.
Earlier this month, the European Union disclosed its own plans for an operation at sea, separate from Washington’s Operation Prosperity Guardian.
It raised eyebrows.
Was the EU signalling a strategic shift between the allies? Was it a lack of unity? How would they coordinate? It set analysts’ tongues wagging.
The European mission – called Aspides, after the Greek word for shield – is tightly focused on defence, but its overall objectives are similar.
Announcing it, the EU’s foreign policy chief Josep Borrell stressed that its mode was “purely defensive”. It suggested that he thought the US-UK effort was not.
Read more: Disagreement over Red Sea naval mission reflects EU divisions
Soft engagement
Europe’s nations are familiar with the region, its politics and geography. They have run military operations in the area for decades, including at sea.
France, for instance, has two military bases, in Abu Dhabi and Djibouti; Italy has a history of activity around the Horn of Africa; Spain leads the successful Atalanta anti-piracy operation off the coast of Somalia, an EU initiative since 2008.
More specifically, the European Maritime Awareness in the Strait of Hormuz (EMASoH) was launched in 2020 amid tensions with groups linked to Iran. It runs monitoring operations from its Abu Dhabi HQ along this key shipping lane.
Aspides will not involve offensive operations against the Houthis, who see their attacks on Western ships as a way of showing support to Palestinians as Israel wages war on Gaza.
This 'defensive-only' distinction from the US-led effort has been welcomed in places like the neighbouring states of Saudi Arabia, the United Arab Emirates, and Oman.