Italy demanded on Thursday the EU find other ports to disembark migrants rescued in the Mediterranean, suggesting it would withhold support for the EU naval mission against people-smuggling unless other countries take in survivors.

Italy became the main route into Europe for hundreds of thousands of asylum seekers arriving by sea since the other main route from Turkey to Greece was largely shut in 2016. While numbers have dropped over the past year, a new populist Italian government has made shutting down the route a pillar of policy.

It forced the port issue on Thursday onto a meeting of EU defence ministers, who need Italian support for their naval mission, known as Sofia, which expires in four months and now brings all migrants it rescues to Italy.

"It's no longer possible that Italy be the only port of disembarkation and that it take in all the migrants rescued at sea," Italian Defence Minister Elisabetta Trenta said in Vienna after the meeting with her 27 counterparts.

The Italian demand follows diplomatic rows in which rescue ships were not allowed to dock in Italy unless other states agreed to take in the migrants on board.

"Some (EU governments) said we should change the Sophia mission when its mandate ends.... We think it's too long to wait and should be done immediately," said Trenta, who said she had been in talks with France and Spain.

Speaking in Venice on Thursday, Italy's anti-immigrant Interior Minister Matteo Salvini also hinted at an end to the EU mission, saying that if EU partners do not agree to offer ports "then we'll go it alone".

No country offered ports at the Vienna defence ministers' meeting as an alternative to Italy for Sophia, although EU foreign policy chief Federica Mogherini said she expected talks to continue.

"Today was not a matter of pledging ports," said Mogherini, who chaired the meeting, saying there was a political will to find a solution and that other options existed, such as sending a larger number of those who arrive in Italy to other EU states.

Italy's Foreign Minister Enzo Moavero Milanesi said he would insist on the migration issue at a meeting with his counterparts, also in Vienna on Thursday, saying governments had to live up to European values on human rights and unity.

"We write solidarity everywhere in Europe, we talk about it, well, (this is a) wonderful occasion to show it," he told reporters.

The head of Spanish charity Proactiva Open Arms said on Thursday it was becoming hard to operate a rescue mission in the Western Mediterranean since Italy and Malta closed their ports.

"Where can we buy fuel? In what port can we do repairs?" he said. "It hard for our boats to operate in these conditions."

The aid group said on Thursday it would move some resources from the Mediterranean to the Strait of Gibraltar to help the Spanish coast guard with sea rescues as Spain becomes the new main entry point for asylum seekers fleeing Africa.

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