Turkey's foreign minister has repeated a call for a no-fly zone over northern Syria to boost security and allow more refugees to return home while enabling more local troops to be trained in their fight against Islamic State group fighters.

Mevlut Cavusoglu told reporters after talks with NATO Secretary General Jens Stoltenberg Friday that newly trained local troops would be essential to retake territory from IS troops in places such as Raqqa and Mosul. He conceded that establishing a no-fly zone would require U.N. Security Council authorization.

Stoltenberg skirted a question whether NATO supports a no-fly zone. But he underscored that training local troops to take the fight to IS would be critical instead of the alliance having to deploy any large military contingent.