Russia on Saturday halted its role in the Black Sea deal for an "indefinite term", cutting shipments from one of the world's top grain exporters, because it said it could not "guarantee safety of civilian ships" travelling under the pact after an attack on its Black Sea fleet.

The move has sparked an outcry from Ukraine, NATO, the European Union and the United States, while the United Nations and Turkey, two main brokers of the July deal, scrambled on Sunday to save it.

Following Russia's move, Chicago wheat futures jumped more than 5% on Monday as both Russia and Ukraine are among the world's largest wheat exporters, analysts said.