This cache is located in Poznyaki Park, a short walk from the Poznyaki metro station. In recent months I've passed by this park many times while walking from my office to the metro.
This park has a playground for kids, benches to relax on, and at N50 24.120 E30 38.130 you can find one of the many artesian wells in Kyiv.
The cache is a small black micro hanging in a tree. You will have to reach for this one! Please keep an eye out for muggles.