

The US is rarely invading countries. Mostly it is just bombing or a fairly small special operation, but not a full scale invasion. The two large scale invasion of this century namely Iraq and Afghanistan ended up both being failures for the US on a strategic level.
















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.