The EU's delayed naval mission to enforce an arms embargo on Libya will be ready to begin work in the coming days, officials told AFP on Wednesday.

EU states agreed on Monday to equip the new operation with ships, planes and satellites, a spokesman for the bloc's diplomatic chief told AFP.

Operation Irini, as the mission is known, aims to halt the flow of arms into Libya, where the UN-recognised Tripoli government is under attack from the forces of strongman Khalifa Haftar, who controls much of the south and east.

"Irini has the necessary resources to begin its mission," said Peter Stano, spokesman for EU diplomatic chief Josep Borrell.

An Italian navy ship will reach the zone of operations - in the eastern Mediterranean - in the coming days, a diplomatic source told AFP.

It will be supported initially by ships from other EU nations in the area until the arrival of vessels formally attached to the Irini mission.

Stano told reporters that EU states had promised "three naval assets and three air assets", with three more of each in "associated support".

Irini replaces the controversial Operation Sophia, set up in 2015 to fight people-smuggling across the Mediterranean at the height of Europe's migrant crisis, which formally ended at the end of March.

The new mission was supposed to start immediately, but it was held up for nearly a month by bickering between Italy and Greece over who should hold the command.

Agreement over Irini has been hard-fought. The 27 EU states finally reached an accord in principle in February over objections from Austria and Hungary.

They feared the new mission would in effect create a rescue fleet that would ferry migrants across the Mediterranean to Europe.