Kyiv is 5 hours ahead of Brasília
Best overlap: 8:00 AM to 1:00 PM in Brasília is 1:00 PM to 6:00 PM in Kyiv.
Both teams are at their desks between 8:00 AM to 1:00 PM in Brasília and 1:00 PM to 6:00 PM in Kyiv. The shared window is roughly 5 hours; treat its midpoint as the default and you'll keep both teams happy. Note the seasonal wrinkle: when Kyiv is on daylight saving and Brasília isn't, the gap between them grows or shrinks by an hour.