We both purchased properties in the UK prior to being married. They are not in joint names. I assume divorce proceeding in Russia do not take these properties into consideration?
This is correct.
According to the law of Russia:
1) disagreements concerning real estate property belong to exclusive jurisdiction, that is they are considered just according to the center of location of real estate property (article 30 part 1 Code of Civil Procedure of Russia). Russia court is not allowed to perform the division of real estate property that is situated abroad;
2) to the property that is acquired by spouses during their marriage(general property of spouses), refer the profits of each spouse, purchased movable and immovable items, capital issues, fund, the shares in capital and another property gained by spouses during their marriage, that is independent from whom name it is gained (article 34 part 2 of Family Code of Russia). Property that has been depended to each of spouses before they were married, also the property obtained as present by one of spouses at the time of marriage in order of inheritance or by another gratuitous dealerships (the property of each spouse), is being his property (article 36 part 1 of Family Code of Russia).