Ukraine needs to concentrate on the upcoming Battles of Severodonetsk and Izyum, which will be key in the overall Battle of Donbas. If they can win at Izyum and Severodonetsk, Russia is at serious risk of losing the Battle of Donbas.
Of course, I’m no military tactician, so my opinion is worth what you paid for it...
If the Ukies just ran a simple raid on Belgorod and then immediately pulled back the Orcs would probably pull back a division or two to defend the critical city.
I hope they do this since the opportunity is sitting there. It’ll force the Orcs into reacting to an incursion and they’ll freak out and predictably overreact.