Gas stations have run dry in some regions of Russia after Ukrainian drones struck refineries and other oil infrastructure in recent weeks, with motorists waiting in long lines and officials resorting to rationing or cutting off sales altogether.

Estonia's Internal Security Service (ISS) said authorities had found a Ukrainian attack drone that exploded in a farmer's field on their territory, but it blamed Russia for the incursion. Newsweek reached out to the Ukrainian foreign ministry for comment. Any incursion by a drone or missile into the territory of a NATO member will raise alarm.

At least 15 regions throughout Ukraine had been struck in the early morning attack, Kira Rudick, a member of Ukrainian Parliament, said on Monday.