Ukraine is using a new exploding drone to target Russia, say experts. But the 'Beaver' may have one major weakness.

• Ukraine is using new Beaver drones to attack targets within Russia's borders. 
• The drones are being launched from Ukraine, reports indicate. 
• Ukraine has in recent days attacked Moscow, with drones crashing into a high-rise building. 

Ukraine is using a new, long-range drone, known as the "Beaver", to bring the war deep into Russia's borders, according to experts. 

Open-source intelligence experts have posted footage of recent drone attacks in Moscow, and said the aircraft appeared to be Ukrainian Beaver drones.