Russia's like sole lucid foreign policy moment was to recognize the grain deal was what gained it credibility for much of the world. The world is skeptical of the US screaming it's head off about Russian imperialism and whatever but then Russia unilaterally ends the grain deal, destroys grain, pledges to blockade grain and drive up the price
Really hope Ukraine can correctly tell the world "we want to bring you grain but they won't let us"
beyond that, this is like way more explicit than Obama's "red line," just a complete demonstration that you won't do shit