UN Secretary-General Antonio Guterres on Friday called on “all parties” to “make every effort” to extend the agreement on Ukrainian grain exports, including facilitating shipments of Russian grain, his spokesman said. The so-called Black Sea deal, signed in July by the UN, Ukraine, Russia and Turkey, has allowed more than 9 million tons of Ukrainian grain to be exported, easing the global food crisis caused by the war, though uncertainty about whether the agreement will last has already led to rising prices. The confusion has come from Russian statements blasting their inability to export thei…