Moscow is 8 hours ahead of Ottawa
Best overlap: 8:00 AM to 10:00 AM in Ottawa is 4:00 PM to 6:00 PM in Moscow.
Both offices are open during 8:00 AM to 10:00 AM Ottawa time, which is 4:00 PM to 6:00 PM in Moscow. Just 2 hours of shared hours means there's little margin — set 8:00 AM in Ottawa (4:00 PM in Moscow) and start promptly. Just remember Ottawa changes its clocks for daylight saving and Moscow doesn't, so confirm the overlap whenever the seasons turn.