Social democratic slogans such as "the military freedom of alliance serves Sweden well" may soon be a thing of the past.
The so-called security policy dialogue within the Social Democrats is currently underway.
On Sunday, the first of three meetings will be held where party members will discuss arguments for or against NATO membership.
The risk of escalation is worrying
During the party's congress last autumn, it was decided that the Social Democrats are against Swedish membership in NATO.
But the Russian aggression and Finland's rapprochement with the military alliance have made several Social Democrats rethink.
- I think we will land in that we will join NATO.
Not everyone will be happy with it, but I think that is where we will land eventually, says Tommy Gardell (S) in Västerhejdeföreningen on Gotland.
The discussions that begin on Sunday will pave the way for a decision in the party board, a decision that can come as soon as Sunday 15 May.
But there are also many members who are concerned that the party may change its mind about NATO membership.
- I am worried about an escalation around the Baltic Sea and the borders we have, says Meit Fohlin (S) opposition councilor Gotland.
Need for non-aligned calls
She believes that there is a risk that we will not have time to get an overview of the consequences of joining a nuclear alliance.
She also questions whether it is possible to leave NATO and whether it is right that Swedish citizens may be forced to fight for the interests of other countries in the future.
- There is a great need for non-aligned countries in the world that can take another call.
Sweden has historically taken on that role, but it would be more difficult to take on, she says.
Hear more Social Democrats reason in the NATO issue in the video player.
Four questions about a Swedish NATO application
What does a Swedish NATO membership cost?
59 sec
Can one leave NATO?
21 sec
How would Russia respond to Swedish membership?
24 sec
Does NATO membership involve a risk of escalation?
52 sec