It could also be a Viburnum dentatum cultivar. My 'Chicago Luster' is starting to leaf out and it looks like your photo. One yours gets totally leafed out and blooms, an exact id can be made. Whatever cultivar it turns out to be it will be good. I've never met a viburnum I didn't like : ) Remy Here is a link that might be useful: Viburnum dentatum

Might be impatient - but what ever it is it is not happy. I would cut it back to 3 or 4 nodes each stalk and put the cut pieces in either water or pearlite - water works just fine. cut into lengths of 4 or so leave nodes or no less than 6 inches. Change water at least every two days and put is bright light on window sill. Very soon it will get calcified nodules and little roots will come out of the stem and you will have lots of new plants. When the water roots are about 4 - 6 inches - put into soil and keep moist and they will be ready for spring. Be patient - if you keep the water from getting slimy and toss out the few that sort of slime up you will have enough for you and your friends. LOL These are garden plants - not house plants in most zones. Good luck and keep us posted.

Hmm, Ardisia does look similar, but its leaves don't look as radial and its berries always seem to droop, instead of just stick out erect? Carolina Buckthorn (Rhamnus caroliniana) also looks similar, but it doesn't have such large berry clusters and they are suppose to still turn black when fully ripe. Sooo, still at a loss here?

I am not familiar with rusty blackhaw but since it’s a Viburnum it’ll have opposite foliage. Your plant doesn't. If forced to give it a name I’d guess callery pear. Given the healthy clump of Lonicera japonica in the picture I’d not be surprised if it’s another invasive.