President Volodymyr Zelenskiy says the world must respond firmly to any Russian attempts to disrupt Ukraine's grain export corridor.
The head of the NATO military alliance has said Russia must not be allowed victory in what he called the most dangerous moment for Europe since World War II.
Turkish officials say the first ship carrying grain from Ukraine to world markets since Russia's February invasion is on track to arrive safely in Istanbul.
Russian air strikes have killed the owner of one of Ukraine's biggest grain exporters, while Kyiv has hit Moscow's Black Sea fleet headquarters in Sevastopol.
Ukraine's counteroffensive is gathering momentum in the Russian-controlled southern Ukrainian city of Kherson, Britain's defence ministry says.
Russia further slashing its gas supplies to Europe and doubts about Moscow's commitment to the grain export deal show the wider impact of the war in Ukraine.
Moscow insists its strike on Odesa won't harm its grain export deal with Kyiv, saying the attack was "connected exclusively with military infrastructure".
An hours-old deal to unblock grain exports from Ukraine has been placed in jeopardy after Russian missiles struck the key Black Sea port of Odessa.
Turkey says a deal to unblock the exports of Ukrainian grain amid the war and to allow Russia to export grain and fertilisers will be signed in Istanbul.
Ukraine is reporting heavy and sometimes fatal Russian shelling amid what it says are largely unsuccessful attempts by Russian ground forces to advance.
Long-range rocket attacks on Russian forces in southern Ukraine have destroyed an ammunition store and armoured vehicles, Ukraine's military says.
Queensland's resources minister has brushed off the Japanese ambassador's criticism of the state government's recent coal tax hike.
The government's agriculture budget aims to make it easier for farmers to export their products, with hopes the sector will be worth $100 billion by 2030.
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