bbc correspondent jonathon beale visited the advanced positions of the armed forces in the kharkiv region and saw how drones are changing the situation at the front. at the moment, it is one of the most powerful weapons in this war. cheap and serially produced drones, they are capable of destroying the enemy. and here at the front they help ukraine. to slow russia's advance, but this is still not enough. we can contain the further advance thanks to the drones to contain and it is very painful to bite them, but not to win, unfortunately. they call themselves sharp cartouches, like the heroes of the cult british tv series. however, this is all the similarity. they were trained by western special forces. in just a few weeks, they hunted down more than a hundred russian soldiers, tracking them from the sky. today they seem to be hiding, so they are looking for something else. that is, you are taking machine guns from the russians? yes, these are russian aks. oleksandr is fighting for this for the second time. territory for his home, he used to cultivate fields nearby, then he grew strawberrie