Note that I only said "enforce". A country can claim whatever they want within their own borders, but cannot really enforce them across the border.
Even with the laptop warranty case, if some small retailer from Country A shipped a laptop to Scandinavia, but didn't uphold a 2 year warranty, the Scandinavian governments would not be able to force the warranty to be upheld. They can make whatever local judgments they want, but none of them would touch Country A without international agreements in place.
Even with the laptop warranty case, if some small retailer from Country A shipped a laptop to Scandinavia, but didn't uphold a 2 year warranty, the Scandinavian governments would not be able to force the warranty to be upheld. They can make whatever local judgments they want, but none of them would touch Country A without international agreements in place.