Russia said on Tuesday it is preparing to reroute grain shipments from the Sea of Azov after several vessels came under Ukrainian attacks in the sea last week, raising concerns over disruption to a route that handles about a quarter of its grain exports.

Vital maritime corridor closes after 90 vessels – including shadow fleet oil tankers – are attacked in under a week

While its not yet known if Russias grain flows were impacted, prices for wheat gained as much as 4.8%, the most since mid-May.