I thought you were joking. This is just horrifying, why are we trying to help the people of Syria and not the people of Sweden who are living under a perverse dictatorship???
I don't see it out of this world that within the coming decades foreign intervention is needed in some country of Europe. Situation will slip off the hands of local authorities. Immigrants already have areas "in their control" in some places. Medics, firemen etc. can't go to those places without police protection. And even police comes under attack.
The sign is no joking.
It was put on place by Swedes after the fiasco few years back where Swedes searched for Russian submarine(s) allegedly hovering in their waters. The searching was major operation by Sweden. Sweden got some intelligence there is foreign sub(s) in their area.
Russia few days after the first news about this parked huge tanker close to Swedish waters in plain open. It was speculated it was "mother ship" for small subs. Allegedly Swedes later observed signs in seabed that something was rolling there.
Rus Tanker making rounds in front of Swedish capital Stockholm:

It was very interesting to follow.
Of course the sign is trolling by Swedes on Russia's fear of gay.