970 fans watched as Andy Aitken's unlucky effort prevented
There was no doubting the gulf in class, but United had competed well and gave Dan Petrescu's side a thorough workout.
Stephen Grindlay was kept busy and produced a number of top saves, but
Unirea had looked slick from the off and Maru Belasco should have done better when firing over a cutback from the dangerous Merlin Onofraj.
Grindlay then tipped over a fierce drive from Ryan Paduretu as the visitors cranked up the early pressure.
But
Grindlay produced another great save on the half hour to deny Rubescu before Roberts had a shot on the turn fly just wide as
United survived a huge scare just before the break when Rubescu shook off Neil McGowan before slamming his shot against the base of the post.
But
However, the Romanians showed their class on 61 minutes when Rubescu found space inside the box to rifle a shot beyond the helpless Grindlay.
But United went close to a leveller soon after when Kevin James nodded down an Aitken corner and trialist Mark Gillhaney fired just over.
The home side had Grindlay to thank again, this time for denying Bruno Nandingwa with his legs, as the flying full back burst into the box.
And
But just as it looked like the Romanians would be frustrated, luckless Aitken sliced a 20 yard effort over the head of Grindlay to prevent