Does the time difference between Dubai and Moscow change during the year?

No. The gap stays at 1h all year.

When is the best time to call Moscow from Dubai?

Between 10:00 and 17:00 in Dubai, which is 09:00 to 16:00 in Moscow.

Dubai is 1h ahead of Moscow. This gap is the same all year — neither city shifts its clocks relative to the other.

Dubai

United Arab Emirates

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Moscow

Russia

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A 9-to-5 day in each city overlaps for 7h. That is 10:00–17:00 in Dubai, which is 09:00–16:00 in Moscow.

City	Time zone	UTC offset
Dubai · United Arab Emirates	Asia/Dubai	UTC+4
Moscow · Russia	Europe/Moscow	UTC+3

What is the time difference between Dubai and Moscow?: Dubai is 1h ahead of Moscow. This gap is the same all year — neither city shifts its clocks relative to the other.
Does the time difference between Dubai and Moscow change during the year?: No. The gap stays at 1h all year.
When is the best time to call Moscow from Dubai?: Between 10:00 and 17:00 in Dubai, which is 09:00 to 16:00 in Moscow.