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James and I agree it looks like an American Robin relative. It looks very much like a fledgling European blackbird, which is in the same genus as the American Robin (Turdus), and is also likely because it is so very common. Here's a photo we found on Google:

[www.wildliferanger.co.uk]

However, looking at the checklist for birds of Romania, they have 7 species in the genus Turdus, and they might look similar as fledglings. There are also other members of the thrush family that it could be but we still think the blackbird is a pretty good bet.

Also a couple general points:

"FWIW, this was in Romania (in the unlikely case it's a species present in Europe but not in North America)"

Not really unlikely, since there are a great many birds present in Europe that would not be found in North America, and vice versa. We were just comparing the bird species checklist for Romania to the Eastern North American birds with which we are familiar. It is very interesting. There is actually more overlap than I would have expected in some groups of birds. The usual field guides don't discuss worldwide distribution, just distribution within the range of the guide, so this information is often overlooked.

"Probably a wing injury, which would lead to starvation, eventually."

That bird looks like a recent fledgling, which is not yet ready to fly. It might be able to flutter up to a low branch but not more than that. Many bird species routinely leave the nest before they can fly, and their parents continue to feed them while they hide out in bushes, etc. If you see a fledgling like this that is not flying, but otherwise looks all right, just let it alone. It's fine. If it's in immediate danger from a road, or a cat, you can move it a short distance but don't take it very far because it still needs its parents, and they are probably close by. If you just take it across the road or whatever, it will peep and the parents will find it.