When troops gather for a large assault they're targeted by drones, analysts said. AdvertisementRussia is struggling to break through Ukraine's defensive lines because when its troops gather to attack, they're targeted by Ukrainian drones, a think tank said. The ISW, citing the source, said that "Russian forces are unable to concentrate in numbers sufficient to break through Ukrainian lines because Ukrainian forces strike all force concentrations larger than a battalion." AdvertisementAccording to the ISW, Ukraine is targeting gatherings of Russian troops and armored vehicles with drone strikes, "preventing Russian forces from even reaching Ukrainian forward defensive lines." AdvertisementBut drones have changed the nature of warfare in Ukraine, preventing large numbers of troops from gathering and taking the enemy by surprise.

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Persons: —, Russian milliblogger Organizations: Service, Institute, European Union, European Council for Foreign Relations Locations: Russia, Ukraine, Ukrainian, Russian, Hungary