Why are Ukrainian drones targeting annexed Crimea's infrastructures?

Kyiv is seeking retribution and one of its targets is Crimea. The peninsula annexed by Russia in 2014 now threatens to become Moscow's Achilles' heel, as Ukraine steps up its attacks targeting bridges, ferries and oil storage facilities.

The strategy appears to be working: fuel and power shortages are becoming increasingly difficult and have forced Russian-installed leaders to introduce temporary measures and Crimeans now find themselves living under bombardment.