Ukraine

Likely lots of factors.

• so many shot down there are fewer to fly
• sanctions hurting repair channels meaning they fly fewer hours to reduce maintenance demands
• longer range Ukrainian missiles exceed the useful operational range of helicopters so to use them they'd have to station them inside Ukrainian missile range
• Lack of trained pilots? We know that Russian army trainers were put to the front lines (and liquidated), it wouldn't surprised me if this was also done to helicopter trainers so now that they are dead the pipeline for new pilots is drastically reduced.