HELSINKI, Oct 28 (Reuters) - Finland and Sweden will joint 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.The Nordic neighbours asked to join the alliance in May in response to Russia's invasion of Ukraine, but ran into objections from Turkey which accused the two of harbouring groups it deems terrorists."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.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."Swedish daily Aftonbladet on Friday cited sources saying that Turkey had invited Kristersson to a bilateral meeting in Ankara, probably on Nov. 8."