I think the important thing they want to see is that you've genuinely made a home outside of Russia. If you're posted to Ethiopian that doesn't really make it your base.
If you have a home address in UAE or Singapore (or some other hub) with a residency card, that should remove that concern. I have Russian friends, and they've been fine as long as they had a "good" legal residency (or three 😎). And also you've got somewhere to come back to and chill between postings.