Ruslan, an officer in Ukraine’s Special Operations Forces, says the strategy is simple: “To reduce the enemy’s military capabilities and their economic potential.”

He says Ukraine’s Special Operations Forces have carried out hundreds of strikes on oil refineries, weapons factories and ammunition dumps – deep inside enemy territory.

Of course Russia has been doing the same, and on a greater scale. On average it has been launching around 200 Shahed drones a day; Ukraine’s response has been about half that number.

Nor is Russia limiting its strikes to military targets. Its long-range missile and drone attacks have led to massive power cuts right across the country – making life harder for millions of civilians. “I’d like to launch as many drones as Russia does,” Ruslan says. “But we’re scaling up very quickly”.

Ms Tarekh, of Fire Point, says Ukraine may not be able to match Russia’s resources, but, she says, “we are trying to fight with brains and tactics”.

Denys Shtilerman, the chief designer and co-founder of the company, admits there is no “Wunderwaffe” – or wonder weapon.

“The game changer is our will to win,” he says.