Other way around. Russia attacked a Ukrainian grain shipment.

Also no that would be dumb to attack Russian grain shipments. Currently the Russians have a huge issue producing food due to diesel shortages, which makes the harvest basically impossible. Russia selling their grain abroad would lower their own reserves making food shortages more likely.

Ukraine civil infrastructure is a military target? Who started that shit?

If the ruzzia wants to end the war it'd be one easy step for them.

I mean if Russia has no fuel to harvest the grain they have...