Volodymyr Zelenskyy said on Sunday that Ukraine's harvest could be half its usual amount this year due to the Russian invasion.
“Ukrainian harvest this year is under the threat to be twice less,” the Ukrainian president wrote in English on Twitter.
“Our main goal — to prevent global food crisis caused by Russian invasion. Still grains find a way to be delivered alternatively,” he said.
Ukraine is one of the world's most fertile countries and a standstill in the Black Sea has led to soaring food prices and fears that millions will go hungry worldwide.
Russia and Ukraine signed a deal earlier this month to reopen grain and fertiliser exports that have been blocked by the five-month war.
However, optimism over the deal was tarnished less than 24 hours later when Russian missiles hit the port of Odesa, raising doubts about Moscow's commitment to the plan.
The agreement, brokered by Turkey and the UN on July 22, provides for safe passage for ships carrying grain out of three southern Ukrainian ports.
The vessels are due to sail this week and in a bid to safeguard their passage they have been offered up to $50 million in insurance by brokers in London
Insurance market Lloyd's of London, underwriter Ascot and broker Marsh said the scheme would help to ease mounting pressure on global food supplies caused by the war between Russia and Ukraine.
Chris McGill, head of cargo at Ascot, said the new financing was a “bespoke, mission-focused facility” that would help ships to sail through safe corridors from designated Ukrainian ports.
Lloyd's chief of markets Patrick Tiernan said it would “add essential protection” to the deal announced by Turkey and the UN and help address market uncertainty over grain supplies.
Ukraine and Russia sign grain deal — in pictures
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UN Secretary General Antonio Guterres, Ukrainian Infrastructure Minister Oleksandr Kubrakov, Turkish President Recep Tayyip Erdogan and Turkish Defence Minister Hulusi Akar attend a signing ceremony in Istanbul, Turkey. Reuters -
Ukrainian Infrastructure Minister Oleksandr Kubrakov, seated, at the signing ceremony. Reuters -
UN Secretary General Antonio Guterres, left, Russia's Defence Minister Sergei Shoigu, second left, Turkish President Recep Tayyip Erdogan, seated, second right, and Turkish Defence Minister Hulusi Akar at the signing ceremony. Reuters -
Mr Guterres speaks during the signing ceremony. Reuters -
Mr Guterres and Mr Erdogan sit at the start of the signature ceremony for an agreement on the safe transportation of grain and foodstuffs from Ukrainian ports. AFP -
Mr Erdogan speaks at the signing ceremony. Reuters -
Mr Guterres and Turkish Foreign Minister Mevlut Cavusoglu stand together on the day of the deal signing in Istanbul. Reuters -
Roman Abramovich attends the ceremony in Istanbul. Reuters -
Mr Guterres said the deal would clear the way for grain shipments from three Ukrainian ports; Odesa, Chernomorsk and Yuzhny, stabilising runaway prices on the global market. Reuters -
The UN chief said a co-ordination centre would be set up in Istanbul to manage Black Sea traffic. Reuters -
A Turkish national flag, a Russian national flag, a United Nations flag and a Ukrainian national flag in Istanbul, before the deal was signed. AFP
