By Michelle NicholsJPMorgan had handled some Russian grain export payments for the past few months with reassurances from Washington. Story continuesUS SAYS RUSSIA HAS STRONG EXPORTS"It has put forth a number of different demands and all of them having to do with various Russian institutions not getting services from the private sector," he told reporters. The United Nations has argued that the deal helped everyone because it brought prices down 23% from a record high in the weeks following Russia's invasion