Black Sea export of Ukrainian grain left the port of Odesa early on Sunday ahead of a deadline to extend the agreement, according to a Reuters witness and MarineTraffic.  United Nations spokesman said on Friday that Secretary-General Antonio Guterres was waiting for a response from Russian President Vladimir Putin on a proposal to extend the deal. (Reporting by Iryna Nazarchuk and Dan Peleschuk; editing by Barbara Lewis)please email: [email protected][email protected]