Russia said its Vasily Bykov patrol ship fired with automatic weapons on the "Sukru Okan" vessel after the captain did not respond to a request to halt for an inspection.
The halt of the Black Sea Grain Initiative, previously brokered by the UN and Turkey, has caused global food prices to surge after months of stability.
Footage shared online of the attack from a camera on one of the drones showed the drone ramming into the warship.
The attack prompted the Novorossiysk port to temporarily halt all ship movement.
"Enough treating the world's most vulnerable people as leverage. Enough of this unjustified unconscionable war," Blinken stated.
Buildings and silos alike went up in flames following alleged Russian drone attacks.
Also, for the first time since the expiration of the grain deal, several foreign cargo ships arrived in the Izmail port via the Black Sea on Sunday, Ukrainian media reported.
Russia stepped away from an agreement that allowed Ukraine to export grain from its ports in mid-July.
Ukraine's border guard service said it had intercepted a warning communicated by a Russian warship to a civilian vessel near a Ukrainian port.
Russian media reported that the servicemember was offered Ukrainian citizenship and money by Ukraine's Security Service.
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