Medellín is 7 hours behind Kyiv
Best overlap: 3:00 PM to 6:00 PM in Kyiv is 8:00 AM to 11:00 AM in Medellín.
For the smoothest call, aim inside 3:00 PM to 6:00 PM in Kyiv, i.e. 8:00 AM to 11:00 AM in Medellín. Medellín is 7 hours behind Kyiv, so you've got a workable 3-hour overlap — ideal for a standing meeting around 3:00 PM in Kyiv (8:00 AM in Medellín). For part of the year the maths changes: Kyiv observes daylight saving, Medellín does not, shifting the overlap by an hour.