Denmark sent a frigate to join a US-led coalition in the Red Sea, guarding against attacks by Yemen’s Houthis.
The Houthis have targeted commercial and navy vessels in response to Israel’s operations in Gaza.
Shipping firms have diverted vessels around southern Africa since December, avoiding the Red Sea route due to the attacks.
Denmark is sending the Iver Huitfeldt frigate as part of Operation Prosperity Guardian to protect merchant vessels.
Houthi rebels recently fired three ballistic missiles at a US container ship.
The frigate carries US-made Harpoon anti-ship missiles and ESSM surface-to-air interceptor missiles.
Danish special operation forces will not participate in the operation, and the warship will not engage in offensive operations against the Houthis.
Danish shipping companies annually send about 2,500 ships through the Red Sea, representing 15% of the world’s shipping traffic.
Anne Steffensen, head of Danish Shipping, emphasized the need for increased security in the region.