Lt Gen Kyrylo Budanov, Chief of the Defence Intelligence of Ukraine, said in an interview with Le Monde that the intensive use of drones by both sides made it impossible for both Russian and Ukrainian offensive operations to take place.
Another factor is the density of minefields, which has not been seen since the Second World War.
"We know a solution for drones - electronic countermeasures. Mines require specialised equipment. This brings us back to the issue of production capacity. Nothing is unsolvable, but everything must be taken into account," Budanov said.