United Nations Secretary-General Antonio Guterres voiced hope on Monday that Russia would extend an expiring deal that gives safe passage to Ukrainian grain shipments, saying the arrangement was crucial for food security.

The UN chief, addressing reporters in Bali, Indonesia ahead of the G20 Summit, said that talks over the last week had delivered "a lot of progress" on the deal that is set to end on Saturday.

"I am hopeful that the Black Sea grain initiative will be renewed," Guterres said.