Russia lost two attack helicopters in three minutes Monday, picked off in rapid succession by Ukraine’s air defenses, Kyiv’s military authorities said.

The Ka-52 “Alligator” attack choppers were brought down near the town of Berislav in Kherson province along the Dniper River, where Russian forces are bracing for an expected Ukrainian offensive.

“Two Russian Ka-52 attack helicopters were shot down by a unit of the Odesa anti-aircraft missile brigade of the Air Command South,” the Ukrainian air force said in a statement posted to social media.