The Post-Apocalyptic Roadmap/Denmark
Denmark:
Being a relatively unknown country with few enemies (apart from Muslim extremists still irate about the muhammed crisis) Denmark initially faired fairly well, no real military action was taken, might be that extremists found other countries more inviting, or simply that they didn't know where Denmark is.
However indirect effects were felt, the nuking of London sent clouds of radiated dust flying over the north sea, whilst the ocean and general rainy weather absorbed a fair bit, the west coast is not a good place to be, and fish is no longer part of a healthy diet.
As Denmark had relied extensively on NATO for military organisation the army was paralysed, the large groups of "holiday soldiers" or volunteer national guard along with the large amount of police kept mass panic and looting to a minimum, whilst martial law was enacted it hardly came to use, except to enforce order upon left and right-wing confrontations.
The blame for the whole mess was swiftly placed on the US and UK and by extension the current government, they were swiftly disposed by decentralized rules in the various regions.
The heavy dependence on non-expendable resources kept power going for a large part, and the massive agricultural industry secured against famine, and allowed for strong trade with the other Scandinavian countries which had massive natural resources but little farm able land.
Zealand being a strong control-point for oceanic travel in and out of the Baltic Sea, and as such quickly became heavily fortified with whatever naval force could be gathered, tensions continues to escalate.