Ukraine exported on average over the last five years roughly 10M tons of grain, according to this paper. 2M tons of grain export out of Crimea seem to be fantasy numbers, perhaps even if they export all the produced grain and import some back. In 2001 they got 1,4M tons according to this this thesis.
With a bit over 4% of the area of Ukraine Crimea produced roughly 3% of it's grain in 2001. Perhaps I will find some more data specific to the occupied territory.
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