(Bloomberg) Russia halted the Black Sea grain deal, heightening uncertainty over global food supplies by closing a crucial export route for Ukraine, one of the world’s top suppliers of wheat and vegetable oils.Most Read from BloombergDollar’s Busted Bull Run Has Bears Calling End of an EraSingapore House Speaker Resigns in New Blow to Ruling PartyRussia Derails Danone, Carlsberg Exits by Seizing AssetsIsrael Quietly Embeds AI Systems in Deadly Military OperationsUkraine Grain Deal Collapses,