They are exporters but to countries that they mostly have good relationships with. There is little to no export into Europe or the US BUT Russia imports most of it's seeds from Europe. These seeds are one time seeds that means you are not able to seed again from the upspring of them. The seeds for this years seeding have not yet been provided. They will suffer even harder because they will compromise their soil by simply not being able to provide a proper rotation. For the west this is more a logistics problem than anything else other countries can and will pick up the pace on fertilizer and grain production. Russia can not yet provide enough seeds on their own and they will still export grain to their allies as they did before the sanctions. China has build up a pretty big reserve on grain and corn over the last past years and they will have to provide poor countries that would be hit by the production shortages to prevent their investment ie. in Africa in the last decade getting nullified. It's really not that big of a problem everyone wants to make it out to be and it will be worse for Russia than for the rest of the world. Russia will have the biggest problem on secondary fruits like potatoes and sugar beet that they will have to import in exchange for a higher export of an increased grain production. We will see an increase in prizes but there will be no shortages of oil or flour in your grocery shop next door except through the influence of hoarding in the beginning.
These are good articles about their problems with producing seeds
https://www.agroberichtenbuitenland.nl/actueel/nieuws/2021/1...
https://www.agroberichtenbuitenland.nl/actueel/nieuws/2022/0...
https://germination.ca/russia-to-up-seed-game/