>it's owned by private companies.

So what? If it's on Swedish ground then it's under Swedish government(military) enforcement in case the shit hits the fan.

>The government could impose legislation to force providers to comply with shutting down international peering but I have a hard time seeing it pass.

Do you think if Russia invades Sweden tomorrow, private businesses can still do whatever they want like in peacetime, or will they have to follow the new waartime rules set by the government and enforced by armed soldiers knocking on their door dragging them to court if they refuse to comply?