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Those can't be stopped, though on some routes Ukraine has now erected netting to try to catch the drones before they can hit their target.

Bouanga doubled the advantage 40 seconds into the second half, curling a right-footed shot from the left edge of the penalty area into the side netting at the far post.

"It was like all these experiences fluttering by me," he says, "and I was netting them with my pen and writing them down, so I could always have a memory of them."

Much has been made about United's issues at both ends of the pitch - keeping only seven clean sheets at the back and netting just 28 goals up front.

A contracted helicopter team followed the radio frequency emitted by the collars and essentially chased the wolves down, sometimes netting them or darting them from the sky, according to Hunnicutt.