How did it happen that Russia and Ukraine increased their wheat production during the last 10 to 15 years?” The answer is simple: They still have huge unused land to utilise. Russia is the biggest country in the world and Ukraine is one of the biggest in Europe. What would be the crop of choice to grow in rural areas of tens of millions of acres? Grain is relatively easy to grow, store, and transport compared with other crops such as fruits and vegetables and seems to be the answer to this question.
more info you will find below
https://www.agriculture.com/news/crops/russia-us-wheat-acreage-gap-seen-widening