Ukraine at this time has no air to ground attack aircraft. Except maybe a few drones. It is reported just now that Bulgaria is sending a number of Sukhoi aircraft which can attack ground targets effectively. The convoy is a perfect target for these planes. Sadly they don’t have any A-10s. Then again a few javelins fired at the lead vehicles and rear vehicles would force the convoy to deploy off road, slowing them considerably.
IEDs would as well. Hopefully that's in the Ukrainians' plans.
Hard to believe that the Bulgarians, who traditionally are extremely close to the Russians in many ways would send aircraft that are meant to kill Russians. Sure the Turks were more than delighted to send drones and be well paid as well. The Turks really don’t like Russia and have a primordial fear that the Russians will one day retake Constantinople. Explains Turkey’s membership in NATO more than anything. Strange times.