International governments failed to act against Houthi aggression in the Red Sea despite repeated warnings about the group’s use of mines and sea drones before the latest wave of attacks against commercial shipping, the internationally recognised government of Yemen said.

In a submission to the International Maritime Organization, the United Nations-backed administration, the rival of the Houthi regime, said that it did not receive “any serious response” after it warned of the dangers during the country’s civil war.