Saw mention of Tatiana - don't forget that she also has a list of tomatoes by country of origin on her website!
At the top of this page (
http://tatianastomatobase.com/wiki/Category:Russian_Tomatoes), there are subcategories of Belarus, Ukraine and Moldovan tomatoes.
J&L Gardens has a nice selection of Ukrainian and Russian tomatoes as well:
https://jandlgardens.com/xencart/index.php?main_page=index&cPath=88_90 (Russian varieties)
https://jandlgardens.com/xencart/index.php?main_page=index&cPath=88_92 (Ukrainian varieties)
I have some Aladdin's Lamp seeds planted. Aladdin's Lamp is a Russian variety, it doesn't seem overly common - but it is for sale here in the U.S.
I also have Saraev M-22 seeds like William does. I could find a place for a seedling of it. Might have Stupice seeds lying around somewhere.
Normally, I don't grow things to preserve them, but I wouldn't mind growing these things in order to give them back to Ukrainians sometimes (hopefully) in the near future. Russian civilians are apparently starting to starve, having other issues.
If I do send seeds / preserve a few varieties, I would probably toss in some of the habrochaites hybrids because they may be early / cold tolerant.