Finland and Sweden will join NATO at the same time, their prime ministers said on Friday, presenting a united front to Turkey which has raised questions about both their applications, Reuters reported.

Finnish Prime Minister Sanna Marin said on Friday Turkey's president had told her he had more questions for Sweden than for her country. But she said she would not leave Sweden behind in the process.

"It is very important for us, of course, that Finland and Sweden would join NATO hand in hand," Marin told reporters at a joint press conference in Helsinki with her Swedish counterpart.

And Swedish Prime Minister Ulf Kristersson, who took office last week, said: "We have been taking every step, so far, hand in hand and none of us have any other ambition."

Kristersson said he would meet Turkish President Erdogan soon. "It's completely legitimate that Turkey gets confirmation that Sweden is doing what Sweden has committed to do within the framework of the agreement," he added.