Moscow is 3 hours ahead of Reykjavik
Best overlap: 8:00 AM to 3:00 PM in Reykjavik is 11:00 AM to 6:00 PM in Moscow.
The overlap falls at 8:00 AM to 3:00 PM in Reykjavik, or 11:00 AM to 6:00 PM if you're in Moscow. Even with Moscow ahead by 3 hours, your workdays overlap by a comfortable 7 hours — plenty of flexibility for both sides.