There are many many sheltered dogs in other countries which could be imported by the Netherlands. A lot of German shelters do that and both of my dogs are/were originally from Romania. In that country they have a huge problem with stray dogs and many end up in killing stations. They even have a shelter with about 6000 dogs in it (Smeura, founded by an Austrian woman) and mostly export them to other countries because Romanians don’t seem to care about dogs.
If anyone wants to adopt a dog from another country I recommend going through local shelters/organizations that already have them imported. There are some sleazy practices going on with people breeding dogs and then selling them as if they were strays. Also you get to meet the dog upfront before making such a big decision.