Ukraine has become an important supplier of corn over the past decade, increasing its exports by 155 percent. However, its share of the global market has only risen from 13.3 percent to 15.8 percent because over that same period, global trade in corn rose by more than 114 percent. The area harvested for corn in Ukraine has increased 24 percent, but its advancement in yield has been below potential.  Over the past decade, the Ukrainian corn yield increased by 1.25 MT/ha whereas the U.S. yield grew by 1.71 MT/ha. This is true even though U.S. yields are already a third greater and should be subject to a diminishing return on productivity gains. The recent change in law ending a 20-year ban on private farm land sales may lead to improved...