The Russians did what parties to a contract usually do when they believe the other party is not performing per the contract: they walked away from it. From Ted Snider at libertarianinstitute.org:
Like the war that necessitated it, Russia’s decision not to renew the United Nations and Turkish-brokered grain deal is bad for the world but not wholly unprovoked.
The deal allowed Ukraine safe passage for its grain laden ships through the mined and blockaded Black Sea ports so it could continue to export its agriculture to the world.
On July 17, Russia announced its decision not to renew the deal.
It has repeatedly been reported that Russia’s decision is retaliation for Ukraine’s recent sabotage of the Kerch Strait bridge that links Crimea to the Russian mainland. But President Vladimir Putin had announced the distinct possibility of suspending the agreement prior to the attack on the bridge.
During a July 13 question period, in a response to a journalist, Putin said, prior to the attack on the bridge, “We can suspend our participation in this deal.”
Putin gave two reasons for suspending the deal after having “extended this so-called deal many times.” The first is that, though it was Russia that suspended the deal, it was the West that broke it. “As for the conditions under which we agreed to ensure the safe export of Ukrainian grain, yes, there were clauses in this agreement with the United Nations, according to which Russian interests had to be taken into account as well,” Putin said. “Not a single clause related to what is in the interests of the Russian Federation has been fulfilled.”
Meanwhile several plus African nations were promised free grain from Russia and Putin gifted a helicopter to the leader of Zimbabwe!