Just as in Moscow, there's a German Sector that establishes trade with Germany, so there should be a Ukrainian Sector to establish good relations in trading with Ukraine!

Very successful to retain good relations among neighbors.

--where cultural festivals are planned, together.

Show off  your wares and cultural achievements--people to people; and your heritages!

Such neighborhoods could function throughout your regional's cities.

My opinion. Don't destroy another's culture; add to theirs, benefits for them!