UNITED NATIONS (Reuters) - Russia said on Friday that U.S. bank JPMorgan had this week stopped processing payments for the Russian Agricultural Bank as Moscow demanded action, not promises, from Washington to help Russian grain and fertilizer reach global markets.Moscow has a list of demands it wants met before it will return to a deal, which it quit on July 17, that had allowed the safe Black Sea exports of Ukraine grain for the past year. Under a related pact - also brokered in July 2022 - U.N. officials agreed to help facilitate Russian food and fertilizer exports."As soon as...