Sweden, Denmark and Chile. Are all these countries NATO?
No, only Denmark. Chile is probably somewhat hostile to the US, they just installed a new left wing government. Sweden is historically neutral, (for the last couple of centuries that is) but it's a well armed neutrality.
The Swedes have been neutral for a long time so didn't join. There are Chile is about as far from North Atlantic as one can get, for that matter there are no Latin or South American NATO members. Just the Danish embassy at the first fire bombing and the Norwegian embassy about 4 miles away at the second fire bombing count towards NATO assaults. There are at least reports that the police tried to prevent the second assault. The loss of life is thankfully smaller, but diplomatically this is the same as the bombings of our African embassies under Clinton. Under NATO an attack on one member should count as an attack on all members.
I think Denmark is, but Sweden and Chile are not.