Hi,
I co-founded and run a charity that adopts dogs from Eastern Europe. There's lots of misinformed commenting on here, so whilst I usually wouldn't engage I wanted to clear a few things up.
1 - DISEASES: all dogs that enter the UK must pass DEFRA requirements. That means they must be chipped and vaccinated for all the obvious nasties (including rabies) and their blood is tested a month later to confirm the presence of antibodies. On arrival in the UK dogs must pass a vet check and a 48 hour quarantine in DEFRA approved kennels. Dogs coming into the UK are safer from a disease perspective than any already in the UK. Recently there has been extensive clamping down on dogs travelling in to the UK to control Romanian puppy farming, so every dog leaving a country has a file 'opened' and that file cannot be 'closed' until the dog completes. Every dog has a huge file of paperwork and extensive tracking, far more than a UK dog. Obviously behaviour can be hidden in some ways, but aggressive dogs will not pass the vet check.
The only thing they may not be vaccinated for is Kennel Cough because it doesn't exist in some Eastern European countries.
2 - WHY ADOPT FROM EASTERN EUROPE: well that's multi-layered and you may agree or not. The main argument - if I were being a bit blunt - is what difference does it make? A dog in need is a dog in need.
However, I think the answer is more complicated. Firstly, UK rescues place INSANE requirements on adopters. We generally rehome to wonderful people who have jobs/mild disabilities/children all of which gets them rejected from other rescues. We have even rehomed to people who WFH but live in flats next to green spaces
Secondly, in my opinion and experience, UK rescue dogs are often (not always obvs) in rescue because idiots have adopted cute puppies with no idea how to train them and the consequence is they have learnt bad behaviour. Our dogs have two desires: a loving home and food. And they will do whatever you want them to do if they get those two things. Street dogs rarely have terrible behaviours because that wouldn't help them survive. Survival on the street requires being people and dog friendly, so the friendliest gene pool tends to survive. Of course, once in a home they can if allowed develop a 'you can't have this' attitude, they aren't perfect, but having rehired over a thousand Eastern European dogs, only a handful have developed behavioural issues.
Lastly, conditions in these countries are worth saving dogs from. In the country I operate in the average monthly income is €300, and city workers in the dog pounds are horrific. Drugs that are supposed to be used to humanely euthanise dogs are stolen by workers and sold to subsidise their income. We recently took over welfare at a city fund and the dogs were being 'euthanised' with plastic shopping bags/being set fire. In the UK the WORST fate a dog faces is humane euthanising. To not be active in these countries and showing those in charge that people outside the country are watching puts yet more dogs at risk of horrific endings.
I might add - rehoming in the UK is the SMALLEST part of our work. Our main goal is proving we can humanely control dog populations through neutering, sadly people don't donate to CNR schemes, they like their donation to have a 'face' - it's why so many rescues are forced to share sad rescue videos.
Anyway. I hope that's useful to some people. I'm not interested in getting into big debates about it, but it's blatantly silly to tar ALL dogs from one country/area with the same brush based on a couple of experiences across a lifetime. I have had dogs all my life. I now have 3 dogs, 2 from Romania and 1 from Serbia. I've never had a moment of aggression from any of them and they are the easiest dogs I've ever owned. I cannot recommend Eastern European dogs highly enough.
If you are considering adopting a dog from abroad, go with one that has rescue back-up/a fostering system in the UK. Ideally do a foster-to-adopt placement to make sure the dog is right for you.