Ukraine's export bans are understandable considering the havoc being wrought on domestic production and difficulties in securing bulk imports due to Russia's blockades of Ukraine's ports.
That's a really weird way to say Ukraine mined their ports preventing shipping. Russia literally offered to help clear the mines and establish a corridor for shipping grain last I checked.
Meanwhile, Russia hasn't banned exports of food either. What they said is that they want to be paid in roubles. Russia just had a summit with African nations to discuss food exports there.
It's also bizarre that the article fails to mention the primary cause for the food crisis, which is the fact that the west decided to ban import of fertilizer from Russia and Belarus. The actual exports of grain from Ukraine account for around 2.5% of the overall market.
This article appears to be full of misinformation.