There’s about a 100 miles between the eastern Ukrainian border (the pre-2014) and the front line where the gloves were already off in terms of Ukraine being allowed to hit Russian targets if they can so I’m not sure this will be a game changer.
Russia have been building up forces on their own territory and then moving them into Ukraine when ready to attack. This potentially gives Ukraine the option of striking troop/equipment concentrations close to the border, and longer term potentially allows them to shoot down jets dropping bombs in the region.
