Barricade the doors, alcove, windows and tell everyone I know in the area to either do the same or GTFO out of town. Then call the army, tell them to either bring in armor with heavy weapons (maybe an attack helicopter) or forget it. Then huddle up for possibly several weeks until the Hungarian authorities get their shit together to kill all of them. Hope they don't decide to shell the apartment blocks.
I would actually tell the cops the same or just that they should grab their families and GTFO. Calling them in here for help would just get them slaughtered, it would take an entire commando team to take down just one.
I'm sure that they will eventually find enough people around to quickly start a slaughterfest to make the seriousness of their threat known, no matter what I do. I'd photograph and video that with my phone and send that as information to people around.
If I have the bravery, I would organize with my neightbours to block the glass windows in the entrance of the apartment block. If the Deathclaws see people moving behind the glass, they'll just brake the glass and then we are fucked. So block the glass, preferably up to the first three floors (there are windows on the stairway) to remove temptation, maybe do it at night (which is going to be problematic because we have motion-trigerred lights, maybe take those out with my pellet-gun). Lock and barricade doors on roof and basement to pre-emtively prevent them (the Deathclaws) from using it. I would look into the basement having any sewer openings that could allow evacuating residents. I'd advise the neighbors to block all their own windows and keep everything they do at low volume to not attract attention. Hopefully we can swap around food to last until they take care of the deatclaws. If we need to make food-runs to the nearby supermarket, we'd do them by pulling them up from an alcove via rope-ladder rather than by door.
I do not know what these things are, like literally, newer heard of them. Can they break through reinforced doors or climb up stairs?
In a word? Yes. To everything.
The name? Absolutely warranted. These things aren't just strong and fast, they are cunning and aggressive. In their own universe these things can take on people with power armor and heavy weapons.
These are high-level mutated monsters in the Fallout franchise that are always top-level. They are a death sentence to all but the most high-level and well-equipped characters. They are literary one of the most powerful non-sentient mutant-type enemies the game can throw at you.
So odds are you that even doing the most intelligent thing, everyone here on SDN that doesn't have a panic room equivalent or high-power small arms, is going to be fucked.
So the question isn't what they can do but what they can't do. I live in a ten-story apartment with a sheer wall and I would not put it past them to climb THAT to the roof.