NATO Secretary General Jens Stoltenberg said on Thursday that "concerns" raised by Turkey over Sweden and Finland's applications to join the military alliance were being addressed.

"Of course, we are addressing the concerns that Turkey has expressed," to find "an agreement on how to move forward," Stoltenberg told a Copenhagen conference, after Turkey opposed the applications of the two Nordic countries over what it considers leniency toward Kurdish militant groups.

British Defense Secretary Ben Wallace said on Thursday he believed there was a way to address the Turkish objections.